build(workflow): update Docker build and push actions

.gitea/workflows/release.yml

@@ -46,13 +46,18 @@ jobs:
           echo "TAG=$TAG" >> $GITHUB_ENV
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Build Image
-        run: docker buildx build -f backend/.docker/Dockerfile -t git.kjan.de/szut/casino-backend:${{ env.TAG }} -t git.kjan.de/szut/casino-backend:latest backend
       - name: Login
         uses: docker/login-action@v3
         with:
           registry: git.kjan.de
           username: ${{ secrets.DOCKER_USER }}
           password: ${{ secrets.DOCKER_PASS }}
-      - name: Push
-        run: docker push git.kjan.de/szut/casino-backend:latest
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: backend/
+          file: backend/.docker/Dockerfile
+          push: true
+          tags: |
+            git.kjan.de/szut/casino-backend:latest
+            git.kjan.de/szut/casino-backend:${{ env.TAG }}