Adding multiarch image support (#1474)

.github/workflows/release.yaml

@@ -0,0 +1,56 @@
+name: Publish image
+
+on:
+  release:
+    types: [released]
+
+jobs:
+  build:
+    env:
+      IMAGE_NAME: gcr.io/kaniko-project/executor
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get latest release tag      
+        uses: oprypin/find-latest-tag@v1
+        with:
+          repository: GoogleContainerTools/kaniko  # The repository to scan.
+          releases-only: true  # We know that all relevant tags have a GitHub release for them.
+        id: kaniko  
+
+      - name: Clone source code
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ steps.kaniko.outputs.tag }}
+      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+  
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+
+      - name: Setup gcloud CLI 
+        uses: GoogleCloudPlatform/github-actions/setup-gcloud@master
+        with:
+          service_account_key: ${{ secrets.GCR_DEVOPS_SERVICE_ACCOUNT_KEY }}
+          project_id: kaniko-project
+          export_default_credentials: true
+        
+      - name: Build and push image
+        run: |
+          gcloud auth configure-docker -q
+          IMAGE_VERSION="$(git describe --tags --abbrev=0)"
+          SHORT_SHA1=$(git rev-parse --short HEAD)
+          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
+          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
+          docker buildx build --platform "${PLATFORMS}" -t "${IMAGE_NAME}:${IMAGE_VERSION}" -t "${IMAGE_NAME}:latest" -f ./deploy/Dockerfile \
+            --push .
+