Release docker image for arm64

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: ci
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login do docker.io
+        run: docker login -u centos -p ${{ secrets.DOCKER_TOKEN }}
+      - name: build and publish image
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./systemd/centos7/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: centos/systemd:latest