Dynamic registry and image name in workflow

This update modifies the GitHub Actions workflow to dynamically determine the container registry and image name based on the server environment. It also ensures that the image name is in lowercase and updates the login and build steps accordingly.

.github/workflows/container-build.yml

@@ -22,16 +22,38 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Log in to GitHub Container Registry
+      # 1. Determine Registry and Image Name dynamically
+      - name: Prepare Registry Environment
+        id: prep
+        run: |
+          # Check if running on GitHub or Gitea
+          if [[ "${{ github.server_url }}" == *"github.com"* ]]; then
+            echo "Running on GitHub"
+            echo "REGISTRY=ghcr.io" >> $GITHUB_ENV
+          else
+            echo "Running on Gitea"
+            # Strip 'https://' and trailing slashes from the server URL to get the hostname
+            # e.g., https://gitea.my-server.com/ -> gitea.my-server.com
+            CLEAN_HOST=$(echo "${{ github.server_url }}" | sed -e 's|^[^/]*//||' -e 's|/.*$||')
+            echo "REGISTRY=$CLEAN_HOST" >> $GITHUB_ENV
+          fi
+
+          # Docker images must be lowercase. GitHub/Gitea repos might contain uppercase.
+          IMAGE_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
+          echo "IMAGE_NAME=$IMAGE_NAME" >> $GITHUB_ENV
+
+      # 2. Login using the dynamic REGISTRY variable
+      - name: Log in to Container Registry
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
+          registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      # 3. Push using dynamic tags
       - name: Build and push multi-arch Docker image
         uses: docker/build-push-action@v5
         with:
@@ -39,7 +61,7 @@ jobs:
           push: true
           platforms: linux/amd64,linux/arm64
           tags: |
-            ghcr.io/${{ github.repository }}:latest
-            ghcr.io/${{ github.repository }}:${{ github.sha }}
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
           cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-to: type=gha,mode=max