stages/systemd:support for user service dropin

systemd unit stage will now be able to add user unit dropin,
this is done by adding an additional field:unit-type
which is set to system by default. It also adds ability
to update the unit config with ConditionPathExists.
Relevant testing updated for the new workflow.

Signed-off-by: Sayan Paul <paul.sayan@gmail.com>

test/data/stages/systemd.unit/b.json

@@ -470,6 +470,19 @@
             }
           }
         }
+      },
+      {
+        "name": "org.osbuild.systemd.unit",
+        "options": {
+          "unit": "grub-boot-success.timer",
+          "dropin": "10-disable-if-greenboot.conf",
+          "unit-type": "global",
+          "config": {
+            "Unit": {
+              "ConditionPathExists": "/usr/lib/greenboot/greenboot"
+            }
+          }
+        }
       }
     ]
   },

test/data/stages/systemd.unit/b.mpp.yaml

@@ -26,3 +26,11 @@ pipeline:
         config:
           Service:
             Environment: NM_CLOUD_SETUP_EC2=yes
+    - name: org.osbuild.systemd.unit
+      options:
+        unit: grub-boot-success.timer
+        dropin: 10-disable-if-greenboot.conf
+        unit-type: global
+        config:
+          Unit:
+            ConditionPathExists: /usr/lib/greenboot/greenboot

test/data/stages/systemd.unit/diff.json

@@ -1,7 +1,9 @@
 {
   "added_files": [
     "/usr/lib/systemd/system/nm-cloud-setup.service.d",
-    "/usr/lib/systemd/system/nm-cloud-setup.service.d/10-rh-enable-for-ec2.conf"
+    "/usr/lib/systemd/system/nm-cloud-setup.service.d/10-rh-enable-for-ec2.conf",
+    "/usr/lib/systemd/user/grub-boot-success.timer.d",
+    "/usr/lib/systemd/user/grub-boot-success.timer.d/10-disable-if-greenboot.conf"
   ],
   "deleted_files": [],
   "differences": {}