refactor: switch to using docker/login-action for container registry authentication

.gitea/workflows/docker-build.yml

@@ -21,8 +21,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Login to Gitea Registry
-        run: echo ${{ secrets.ACCESS_TOKEN }} | docker login git.almazlar.com -u ${{ gitea.actor }} --password-stdin
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.ACCESS_TOKEN }}
 
       - name: Extract metadata (tags, labels) for Backend
         id: meta-backend