ci: Fix docker image pushing to Docker Hub (#7548)

* add actions file

* nit

* add multi-platform

* add buildx

* reduce platforms

* remove arm7

* add back arm7

* add missing archs

* remove failing image

* add back in linux/s390x

* switch image name to parse-server

* remove failing images

* nit spelling

* Nit

* add comment about nightly builds

.github/workflows/docker-publish.yml

@@ -0,0 +1,57 @@
+name: docker
+
+on:
+  schedule:
+    - cron: '19 17 * * *' # Nightly builds capture upstream updates to dependency images such as node.
+  push:
+    branches: [ master ]
+    tags: [ '*.*.*' ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: parseplatform/parse-server
+
+jobs:
+  build:
+
+    runs-on: ubuntu-18.04
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up QEMU
+        id: qemu
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Log into Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          flavor: |
+            latest=true
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64/v8
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}