CI: switch to Github Actions to publish multi-arch Docker images

.github/workflows/publish-rolling.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   npm:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix:
@@ -39,8 +39,40 @@ jobs:
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
 
+  docker:
+    runs-on: ubuntu-20.04
+
+    strategy:
+      matrix:
+        platform: ['linux/amd64', 'linux/arm64', 'linux/arm/v7']
+
+    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 to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Publish ${{ matrix.platform }} to Docker Hub
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: ${{ matrix.platform }}
+          push: true
+          tags: |
+            jesec/flood:master
+
   pkg:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix: