Use separate jobs for separate images.

.forgejo/workflows/pkgckeck.yaml

@@ -1,11 +1,15 @@
 on: [push]
+jobs:
+  checkout:
+    runs-on: docker
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
 jobs:
   pgkcheck:
     runs-on: docker
     container:
       image: gittr.ch/linux/pkgcheck:latest
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
       - name: Run repository checks
         run: pkgcheck --color true scan --exit error,style --net .