Merge branch 'feature/improve-container-build'

.github/workflows/publish-image.yaml

@@ -3,7 +3,7 @@ name: Build and publish the production container image to the GitHub Registry
 # Run this workflow every time on every push to the branch `release`.
 on:
   push:
-    branches: ['release']
+    branches: ['feature/improve-container-build']
 
 env:
   IMAGE_NAME: imap-backup
@@ -36,6 +36,10 @@ jobs:
           labels: |
             ${{ env.IMAGE_NAME }}:latest
 
+      # Check that imap-backup runs
+      - name: Test Image
+        run: podman run ${{ env.IMAGE_NAME }}:latest imap-backup help | grep 'Commands:'
+
       - name: Publish Image
         # https://github.com/marketplace/actions/push-to-registry
         id: push-to-registry