Try to push to registry.

.gitea/workflows/release.yml

@@ -25,6 +25,11 @@ jobs:
         with:
           php-version: '7.4'
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver: docker-container
+
       - uses: actions/checkout@v3
 
       - name: Install Dependencies
@@ -45,8 +50,10 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/ri-st/startup
 
-      - name: Build Docker image
-        run: docker build -t cs-git.ddnss.de/ri-st/startup:latest
-
-      - name: Push Docker image
-        run: docker push cs-git.ddnss.de/ri-st/startup:latest
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          tags: ri-st/startup:latest
+          push: true
+#          cache-from: type=gha
+#          cache-to: type=gha,mode=max