Try to push to registry.

.gitea/workflows/release.yml

@@ -48,11 +48,8 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/ri-st/startup
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          tags: https://cs-git.ddnss.de/ri-st/startup:latest
-          push: true
-          load: true
-#          cache-from: type=gha
-#          cache-to: type=gha,mode=max
+      - 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