Also do multi-arch builds on CI

Signed-off-by: Mikolaj Pawlikowski <mikolaj@pawlikowski.pl>

.github/workflows/main.yml

@@ -15,6 +15,8 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: 1.16
+
+      # basics
       - name: Compile the binary
         run: |
           make bin/goldpinger
@@ -22,3 +24,30 @@ jobs:
       - name: Build the Docker image
         run: |
           make build
+
+      # multi-arch build
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build and
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          build-args: GO_MOD_ACTION=download
+          platforms: linux/amd64,linux/arm64
+          target: simple
+      - name: Build and push vendor
+        id: docker_build_vendor
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          flavor: |
+            suffix: -vendor,onlatest=false
+          file: ./Dockerfile
+          build-args: GO_MOD_ACTION=vendor
+          platforms: linux/amd64,linux/arm64
+          target: vendor