try

.gitea/workflows/build-an-push.yaml

@@ -10,15 +10,17 @@ jobs:
      needs: build
      if: gitea.ref == 'refs/heads/main'
      steps:
-      - uses: https://github.com/actions/checkout@v4
-      - uses: https://github.com/docker/setup-buildx-action@v3
+       - name: checkout
+         uses: actions/checkout@v4
+       - name: setup buildx
+         uses: docker/setup-buildx-action@v3
           with:
             config-inline: |
               [registry."192.168.0.151:32000"]
               http = true
               insecure = true            
       - name: Build and push Docker image
-        uses: https://github.com/docker/build-push-action@v5
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./Dockerfile