keep fixing CI 5

.gitea/workflows/backend-docker.yml

@@ -49,12 +49,6 @@ jobs:
           git fetch --depth=1 origin "$SHA" || true
           git checkout -q "$SHA" || true
 
-      - name: Ensure buildx is available
-        shell: bash
-        run: |
-          docker buildx version || true
-          docker buildx create --use || true
-
       - name: Build and push to local registry
         env:
           REGISTRY: 127.0.0.1:5000
@@ -62,11 +56,12 @@ jobs:
         shell: bash
         run: |
           cd /workspace/peipei-backend
-          docker buildx build \
-            --platform linux/amd64 \
+          export DOCKER_BUILDKIT=1
+          docker build \
             --build-arg MIRROR_REG=docker.m.daocloud.io/library/ \
             -f docker/Dockerfile \
             -t ${REGISTRY}/peipei/backend:${TAG} \
             -t ${REGISTRY}/peipei/backend:latest \
-            --push \
             .
+          docker push ${REGISTRY}/peipei/backend:${TAG}
+          docker push ${REGISTRY}/peipei/backend:latest