samples/qcow2: reuse the base image so we don't have to recreate all the time

Signed-off-by: Tom Gundersen <teg@jklm.no>

samples/base-qcow2.json

@@ -2,21 +2,9 @@
   "name": "base-qcow2",
   "stages": [
     {
-      "name": "io.weldr.dnf",
-      "systemResourcesFromEtc": ["/etc/pki"],
+      "name": "io.weldr.untree",
       "options": {
-        "releasever": "29",
-        "repos": {
-          "fedora": {
-            "name": "Fedora",
-            "metalink": "https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch",
-            "gpgkey": "file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$releasever-$basearch"
-          }
-        },
-        "packages": [
-          "@Core",
-          "grub2-pc"
-        ]
+        "tree": "base"
       }
     },
     {

samples/base.json

@@ -15,7 +15,8 @@
         },
         "packages": [
           "@Core",
-          "selinux-policy-targeted"
+          "selinux-policy-targeted",
+          "grub2-pc"
         ]
       }
     }