set up buildx

.github/workflows/build-container.yml

@@ -12,14 +12,16 @@ on:
 jobs:
   docker:
     runs-on: ubuntu-22.04
-    name: Docker Push
+    name: Docker Build and Push
     steps:
       - uses: actions/checkout@v4
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_HUB_USER }}
           password: ${{ secrets.DOCKER_HUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Generate Auth Token
         uses: actions/create-github-app-token@v1
         id: app-token