convert all mpp.yaml files to proper YAML

This is the second step of the conversion. All mpp.yaml json files were loaded
and dumped again with pyyaml. It was tweaked to keep the order of keys and to
save multi-line strings in the "flow" style. This was done, so the GPG keys
are kept on one line. Otherwise, they take up too much visual space.

There is no functional change in this commit.

test/data/manifests/centos-stream-uki.mpp.yaml

@@ -1,250 +1,162 @@
-{
-  "version": "2",
-  "mpp-vars": {
-    "arch": "x86_64",
-    "release": "9",
-    "distribution": "cs$release",
-    "releasever": "el$release",
-    "snapshot": "20230202"
-  },
-  "pipelines": [
-    {
-      "mpp-import-pipeline": {
-        "path": "centos-stream-build.mpp.yaml",
-        "id": "build"
-      },
-      "runner": {
-        "mpp-format-string": "org.osbuild.centos{release}"
-      }
-    },
-    {
-      "name": "tree",
-      "build": "name:build",
-      "stages": [
-        {
-          "type": "org.osbuild.rpm",
-          "inputs": {
-            "packages": {
-              "type": "org.osbuild.files",
-              "origin": "org.osbuild.source",
-              "mpp-depsolve": {
-                "architecture": "$arch",
-                "module-platform-id": "$releasever",
-                "releasever": "$releasever",
-                "repos": [
-                  {
-                    "id": "baseos",
-                    "baseurl": "https://rpmrepo.osbuild.org/v2/mirror/public/$releasever/$distribution-$arch-baseos-$snapshot/"
-                  },
-                  {
-                    "id": "appstream",
-                    "baseurl": "https://rpmrepo.osbuild.org/v2/mirror/public/$releasever/$distribution-$arch-appstream-$snapshot/"
-                  }
-                ],
-                "packages": [
-                  "dnf",
-                  "rpm-ostree",
-                  "ostree",
-                  "pigz",
-                  "kernel",
-                  "kernel-modules",
-                  "kernel-modules-extra",
-                  "glibc-all-langpacks",
-                  "grub2-tools-efi",
-                  "efibootmgr",
-                  "shim-x64",
-                  "grub2-efi-x64-cdboot",
-                  "biosdevname",
-                  "memtest86+",
-                  "syslinux",
-                  "grub2-tools",
-                  "grub2-tools-minimal",
-                  "grub2-tools-extra",
-                  "dracut",
-                  "anaconda-dracut",
-                  "dracut-network",
-                  "dracut-config-generic",
-                  "initscripts",
-                  "cryptsetup",
-                  "rpcbind",
-                  "kbd",
-                  "kbd-misc",
-                  "tar",
-                  "xz",
-                  "curl",
-                  "bzip2",
-                  "systemd-sysv",
-                  "systemd-units",
-                  "rsyslog",
-                  "fcoe-utils",
-                  "net-tools",
-                  "nfs-utils"
-                ]
-              }
-            }
-          },
-          "options": {
-            "gpgkeys": [
-              "-----BEGIN PGP PUBLIC KEY BLOCK-----\n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\n=QWRO\n-----END PGP PUBLIC KEY BLOCK-----\n"
-            ],
-            "exclude": {
-              "docs": true
-            },
-            "disable_dracut": true
-          }
-        },
-        {
-          "type": "org.osbuild.dracut",
-          "options": {
-            "kernel": [
-              {
-                "mpp-format-string": "{rpms['tree']['kernel'].evra}"
-              }
-            ],
-            "add_modules": [
-              "convertfs",
-              "dmsquash-live",
-              "livenet",
-              "pollcdrom",
-              "qemu",
-              "qemu-net"
-            ]
-          }
-        },
-        {
-          "type": "org.osbuild.locale",
-          "options": {
-            "language": "en_US.UTF-8"
-          }
-        },
-        {
-          "type": "org.osbuild.users",
-          "options": {
-            "users": {
-              "root": {
-                "password": ""
-              }
-            }
-          }
-        }
-      ]
-    },
-    {
-      "name": "image",
-      "build": "name:build",
-      "stages": [
-        {
-          "type": "org.osbuild.squashfs",
-          "inputs": {
-            "tree": {
-              "type": "org.osbuild.tree",
-              "origin": "org.osbuild.pipeline",
-              "references": [
-                "name:tree"
-              ]
-            }
-          },
-          "options": {
-            "filename": "rootfs.img",
-            "compression": {
-              "method": "gzip"
-            }
-          }
-        }
-      ]
-    },
-    {
-      "name": "initrd",
-      "build": "name:build",
-      "stages": [
-        {
-          "type": "org.osbuild.gunzip",
-          "inputs": {
-            "file": {
-              "type": "org.osbuild.files",
-              "origin": "org.osbuild.pipeline",
-              "references": {
-                "name:tree": {
-                  "file": {
-                    "mpp-format-string": "/boot/initramfs-{rpms['tree']['kernel'].evra}.img"
-                  }
-                }
-              }
-            }
-          },
-          "options": {
-            "path": "initramfs.img"
-          }
-        },
-        {
-          "type": "org.osbuild.cpio.out",
-          "options": {
-            "filename": "initramfs.img",
-            "append": true
-          },
-          "inputs": {
-            "tree": {
-              "type": "org.osbuild.tree",
-              "origin": "org.osbuild.pipeline",
-              "references": [
-                "name:image"
-              ]
-            }
-          }
-        }
-      ]
-    },
-    {
-      "name": "uki",
-      "build": "name:build",
-      "stages": [
-        {
-          "type": "org.osbuild.uki",
-          "options": {
-            "filename": "linux.efi",
-            "kernel": {
-              "opts": [
-                "root=live:/rootfs.img"
-              ]
-            }
-          },
-          "inputs": {
-            "kernel": {
-              "type": "org.osbuild.files",
-              "origin": "org.osbuild.pipeline",
-              "references": {
-                "name:tree": {
-                  "file": {
-                    "mpp-format-string": "/boot/vmlinuz-{rpms['tree']['kernel'].evra}"
-                  }
-                }
-              }
-            },
-            "initrd": {
-              "type": "org.osbuild.files",
-              "origin": "org.osbuild.pipeline",
-              "references": {
-                "name:initrd": {
-                  "file": {
-                    "mpp-format-string": "/initramfs.img"
-                  }
-                }
-              }
-            },
-            "osrel": {
-              "type": "org.osbuild.files",
-              "origin": "org.osbuild.pipeline",
-              "references": {
-                "name:tree": {
-                  "file": {
-                    "mpp-format-string": "/etc/os-release"
-                  }
-                }
-              }
-            }
-          }
-        }
-      ]
-    }
-  ]
-}
+version: '2'
+mpp-vars:
+  arch: x86_64
+  release: '9'
+  distribution: cs$release
+  releasever: el$release
+  snapshot: '20230202'
+pipelines:
+  - mpp-import-pipeline:
+      path: centos-stream-build.mpp.yaml
+      id: build
+    runner:
+      mpp-format-string: org.osbuild.centos{release}
+  - name: tree
+    build: name:build
+    stages:
+      - type: org.osbuild.rpm
+        inputs:
+          packages:
+            type: org.osbuild.files
+            origin: org.osbuild.source
+            mpp-depsolve:
+              architecture: $arch
+              module-platform-id: $releasever
+              releasever: $releasever
+              repos:
+                - id: baseos
+                  baseurl: https://rpmrepo.osbuild.org/v2/mirror/public/$releasever/$distribution-$arch-baseos-$snapshot/
+                - id: appstream
+                  baseurl: https://rpmrepo.osbuild.org/v2/mirror/public/$releasever/$distribution-$arch-appstream-$snapshot/
+              packages:
+                - dnf
+                - rpm-ostree
+                - ostree
+                - pigz
+                - kernel
+                - kernel-modules
+                - kernel-modules-extra
+                - glibc-all-langpacks
+                - grub2-tools-efi
+                - efibootmgr
+                - shim-x64
+                - grub2-efi-x64-cdboot
+                - biosdevname
+                - memtest86+
+                - syslinux
+                - grub2-tools
+                - grub2-tools-minimal
+                - grub2-tools-extra
+                - dracut
+                - anaconda-dracut
+                - dracut-network
+                - dracut-config-generic
+                - initscripts
+                - cryptsetup
+                - rpcbind
+                - kbd
+                - kbd-misc
+                - tar
+                - xz
+                - curl
+                - bzip2
+                - systemd-sysv
+                - systemd-units
+                - rsyslog
+                - fcoe-utils
+                - net-tools
+                - nfs-utils
+        options:
+          gpgkeys:
+            - "-----BEGIN PGP PUBLIC KEY BLOCK-----\n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\n=QWRO\n-----END PGP PUBLIC KEY BLOCK-----\n"
+          exclude:
+            docs: true
+          disable_dracut: true
+      - type: org.osbuild.dracut
+        options:
+          kernel:
+            - mpp-format-string: '{rpms[''tree''][''kernel''].evra}'
+          add_modules:
+            - convertfs
+            - dmsquash-live
+            - livenet
+            - pollcdrom
+            - qemu
+            - qemu-net
+      - type: org.osbuild.locale
+        options:
+          language: en_US.UTF-8
+      - type: org.osbuild.users
+        options:
+          users:
+            root:
+              password: ''
+  - name: image
+    build: name:build
+    stages:
+      - type: org.osbuild.squashfs
+        inputs:
+          tree:
+            type: org.osbuild.tree
+            origin: org.osbuild.pipeline
+            references:
+              - name:tree
+        options:
+          filename: rootfs.img
+          compression:
+            method: gzip
+  - name: initrd
+    build: name:build
+    stages:
+      - type: org.osbuild.gunzip
+        inputs:
+          file:
+            type: org.osbuild.files
+            origin: org.osbuild.pipeline
+            references:
+              name:tree:
+                file:
+                  mpp-format-string: /boot/initramfs-{rpms['tree']['kernel'].evra}.img
+        options:
+          path: initramfs.img
+      - type: org.osbuild.cpio.out
+        options:
+          filename: initramfs.img
+          append: true
+        inputs:
+          tree:
+            type: org.osbuild.tree
+            origin: org.osbuild.pipeline
+            references:
+              - name:image
+  - name: uki
+    build: name:build
+    stages:
+      - type: org.osbuild.uki
+        options:
+          filename: linux.efi
+          kernel:
+            opts:
+              - root=live:/rootfs.img
+        inputs:
+          kernel:
+            type: org.osbuild.files
+            origin: org.osbuild.pipeline
+            references:
+              name:tree:
+                file:
+                  mpp-format-string: /boot/vmlinuz-{rpms['tree']['kernel'].evra}
+          initrd:
+            type: org.osbuild.files
+            origin: org.osbuild.pipeline
+            references:
+              name:initrd:
+                file:
+                  mpp-format-string: /initramfs.img
+          osrel:
+            type: org.osbuild.files
+            origin: org.osbuild.pipeline
+            references:
+              name:tree:
+                file:
+                  mpp-format-string: /etc/os-release