Use direct docker CLI commands in workflow

.gitea/workflows/build.yml

@@ -12,28 +12,15 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
       - name: Login to Gitea Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: gitea.poettker-cloud.de
-          username: ${{ gitea.actor }}
-          password: ${{ secrets.REGISTRY_TOKEN }}
+        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login gitea.poettker-cloud.de -u "${{ gitea.actor }}" --password-stdin
 
       - name: Build and Push Backend
-        uses: docker/build-push-action@v5
-        with:
-          context: ./paperless-backend
-          platforms: linux/amd64
-          push: true
-          tags: gitea.poettker-cloud.de/bjoernpoettker/paperlessmanager-backend:latest
+        run: |
+          docker build -t gitea.poettker-cloud.de/bjoernpoettker/paperlessmanager-backend:latest ./paperless-backend
+          docker push gitea.poettker-cloud.de/bjoernpoettker/paperlessmanager-backend:latest
 
       - name: Build and Push Frontend
-        uses: docker/build-push-action@v5
-        with:
-          context: ./paperless-frontend
-          platforms: linux/amd64
-          push: true
-          tags: gitea.poettker-cloud.de/bjoernpoettker/paperlessmanager-frontend:latest
+        run: |
+          docker build -t gitea.poettker-cloud.de/bjoernpoettker/paperlessmanager-frontend:latest ./paperless-frontend
+          docker push gitea.poettker-cloud.de/bjoernpoettker/paperlessmanager-frontend:latest