Setup buildx to push to registry.

.gitea/workflows/release.yml

@@ -25,6 +25,9 @@ jobs:
         with:
           php-version: '7.4'
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - uses: actions/checkout@v3
 
       - name: Install Dependencies