Refactor container registry URL handling in workflow

.github/workflows/container-build.yml

@@ -11,11 +11,6 @@ on:
       - 'requirements.txt'
       - 'docker-compose.yml'
 
-env:
-  # This works for both GitHub and Gitea
-  REGISTRY: ${{ github.server_url == 'https://github.com' && 'ghcr.io' || replace(github.server_url, 'https://', '') }}
-  IMAGE_NAME: ${{ github.repository }}
-
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
@@ -27,13 +22,22 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Set registry URL
+        id: registry
+        run: |
+          if [ "${{ github.server_url }}" = "https://github.com" ]; then
+            echo "url=ghcr.io" >> $GITHUB_OUTPUT
+          else
+            echo "url=${{ github.server_url }}" | sed 's|https://||' >> $GITHUB_OUTPUT
+          fi
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
 
       - name: Log in to Container Registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY }}
+          registry: ${{ steps.registry.outputs.url }}
           username: ${{ github.actor }}
           password: ${{ secrets.PACKAGE_TOKEN || secrets.GITHUB_TOKEN }}
 
@@ -47,7 +51,7 @@ jobs:
           push: true
           platforms: linux/amd64,linux/arm64
           tags: |
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
+            ${{ steps.registry.outputs.url }}/${{ github.repository }}:latest
+            ${{ steps.registry.outputs.url }}/${{ github.repository }}:${{ github.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max