build: fix spa-server-docker-cd

Author: timzaak

.github/workflows/spa-server-docker-cd.yml

@@ -38,6 +38,7 @@ jobs:
           tags: timzaak/spa-server:${{github.event.inputs.version}}
 
       - name: build and push spa-server with S3
+        uses: docker/build-push-action@v2
         with:
           context: ./docker
           file: S3FS.Dockerfile