Add Github workflow steps to build multi-architecture Docker images

Author: pbstriker38

.github/workflows/ci.yml

@@ -46,3 +46,36 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           args: release --config .github/goreleaser.yml
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        id: 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: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: jpillora/chisel
+          tag-latest: true
+          # Outputs:
+          # jpillora/chisel:1.2.3
+          # jpillora/chisel:1.2
+          # jpillora/chisel:1
+          # jpillora/chisel:latest
+          tag-semver: |
+            {{version}}
+            {{major}}.{{minor}}
+            {{major}}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/ppc64le,linux/386,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}