Add multi-arch docker-build

This commit adds multi-arch docker builds using docker buildx
to the release script and a new github action.

.github/workflows/build-and-push-dockerhub.yml

@@ -0,0 +1,41 @@
+name: docker
+on:
+  push:
+    tags:
+      - '*'
+jobs:
+  multi:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/beehive
+          tag-sha: false
+      -
+        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: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}

tools/release.sh

@@ -25,6 +25,19 @@ fi
 
 echo "Releasing ${TAG} ..."
 
+# Tag git and push
 git tag -a -s -m "Release ${TAG}" "${TAG}"
 git push --tags
+
+# Run goreleaser
 goreleaser release --rm-dist
+
+# Build and push Docker image
+DOCKER_REPO="fribbledom/beehive"
+docker buildx build \
+    --progress plain \
+    --platform=linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6 \
+    -t="$DOCKER_REPO:$TAG" \
+    -t="$DOCKER_REPO:latest" \
+    --push \
+    .