ci: wait for Docker daemon before steps, switch to docker buildx

.gitea/workflows/build-and-push.yml

@@ -23,6 +23,13 @@ jobs:
       - name: Install dependencies
         run: apk add --no-cache git docker-cli
 
+      - name: Wait for Docker daemon
+        run: |
+          until docker info > /dev/null 2>&1; do
+            echo "Waiting for Docker daemon..."
+            sleep 2
+          done
+
       - name: Checkout
         run: |
           GITEA_HOST="${{ gitea.server_url }}"
@@ -44,6 +51,6 @@ jobs:
           REGISTRY="${REGISTRY#https://}"
           REGISTRY="${REGISTRY#http://}"
           IMAGE="$REGISTRY/${{ gitea.repository }}"
-          docker build -t "$IMAGE:${{ gitea.sha }}" -t "$IMAGE:latest" .
+          docker buildx build -t "$IMAGE:${{ gitea.sha }}" -t "$IMAGE:latest" .
           docker push "$IMAGE:${{ gitea.sha }}"
           docker push "$IMAGE:latest"