add multiatch docker build to support arm

.github/workflows/publish_docker.yml

@@ -4,8 +4,8 @@ on:
   workflow_dispatch:
     inputs:
       vm_id:
-        description: 'The ID of the VM (binary dst in Docker image)'
-        default: ''
+        description: "The ID of the VM (binary dst in Docker image)"
+        default: ""
         required: false
         type: string
 
@@ -17,13 +17,17 @@ on:
 
 jobs:
   publish_docker_image:
-    name: Publish Docker Image
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Publish image to Dockerhub
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+      - name: Build and publish images to DockerHub
         env:
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
           DOCKER_PASS: ${{ secrets.DOCKER_PASS }}
           DOCKER_REPO: "avaplatform/subnet-evm"
-        run: .github/workflows/publish_docker_image.sh ${{ inputs.vm_id }}
+          VM_ID: ${{ inputs.vm_id }}
+          PUBLISH: 1
+          PLATFORMS: "linux/amd64,linux/arm64"
+        run: scripts/build_docker_image.sh

scripts/build_docker_image.sh

@@ -2,8 +2,25 @@
 
 set -euo pipefail
 
+# If set to non-empty, prompts the building of a multi-arch image when the image
+# name indicates use of a registry.
+#
+# A registry is required to build a multi-arch image since a multi-arch image is
+# not really an image at all. A multi-arch image (also called a manifest) is
+# basically a list of arch-specific images available from the same registry that
+# hosts the manifest. Manifests are not supported for local images.
+#
+# Reference: https://docs.docker.com/build/building/multi-platform/
+PLATFORMS="${PLATFORMS:-}"
+
+# If set to non-empty, the image will be published to the registry.
+PUBLISH="${PUBLISH:-}"
+
 # Directory above this script
-SUBNET_EVM_PATH=$( cd "$( dirname "${BASH_SOURCE[0]}" )"; cd .. && pwd )
+SUBNET_EVM_PATH=$(
+  cd "$(dirname "${BASH_SOURCE[0]}")"
+  cd .. && pwd
+)
 
 # Load the constants
 source "$SUBNET_EVM_PATH"/scripts/constants.sh
@@ -14,18 +31,45 @@ source "$SUBNET_EVM_PATH"/scripts/versions.sh
 # WARNING: this will use the most recent commit even if there are un-committed changes present
 BUILD_IMAGE_ID=${BUILD_IMAGE_ID:-"${CURRENT_BRANCH}"}
 
+# buildx (BuildKit) improves the speed and UI of builds over the legacy builder and
+# simplifies creation of multi-arch images.
+#
+# Reference: https://docs.docker.com/build/buildkit/
+DOCKER_CMD="docker buildx build"
+
+if [[ -n "${PUBLISH}" ]]; then
+  DOCKER_CMD="${DOCKER_CMD} --push"
+
+  echo "Pushing $DOCKERHUB_REPO:$BUILD_IMAGE_ID"
+
+  # A populated DOCKER_USERNAME env var triggers login
+  if [[ -n "${DOCKER_USERNAME:-}" ]]; then
+    echo "$DOCKER_PASS" | docker login --username "$DOCKER_USERNAME" --password-stdin
+  fi
+fi
+
+# Build a multi-arch image if requested
+if [[ -n "${PLATFORMS}" ]]; then
+  DOCKER_CMD="${DOCKER_CMD} --platform=${PLATFORMS}"
+fi
+
 VM_ID=${VM_ID:-"${DEFAULT_VM_ID}"}
-if [[ "${VM_ID}" != "${DEFAULT_VM_ID}"  ]]; then
+if [[ "${VM_ID}" != "${DEFAULT_VM_ID}" ]]; then
   DOCKERHUB_TAG="${VM_ID}-${DOCKERHUB_TAG}"
 fi
 
 # Default to the release image. Will need to be overridden when testing against unreleased versions.
 AVALANCHEGO_NODE_IMAGE="${AVALANCHEGO_NODE_IMAGE:-${AVALANCHEGO_IMAGE_NAME}:${AVALANCHE_VERSION}}"
 
 echo "Building Docker Image: $DOCKERHUB_REPO:$BUILD_IMAGE_ID based of AvalancheGo@$AVALANCHE_VERSION"
-docker build -t "$DOCKERHUB_REPO:$BUILD_IMAGE_ID" -t "$DOCKERHUB_REPO:${DOCKERHUB_TAG}" \
- "$SUBNET_EVM_PATH" -f "$SUBNET_EVM_PATH/Dockerfile" \
+${DOCKER_CMD} -t "$DOCKERHUB_REPO:$BUILD_IMAGE_ID" -t "$DOCKERHUB_REPO:${DOCKERHUB_TAG}" \
+  "$SUBNET_EVM_PATH" -f "$SUBNET_EVM_PATH/Dockerfile" \
   --build-arg AVALANCHEGO_NODE_IMAGE="$AVALANCHEGO_NODE_IMAGE" \
   --build-arg SUBNET_EVM_COMMIT="$SUBNET_EVM_COMMIT" \
   --build-arg CURRENT_BRANCH="$CURRENT_BRANCH" \
   --build-arg VM_ID="$VM_ID"
+
+if [[ -n "${PUBLISH}" && $CURRENT_BRANCH == "master" ]]; then
+  echo "Tagging current image as $DOCKERHUB_REPO:latest"
+  docker buildx imagetools create -t "$DOCKERHUB_REPO:latest" "$DOCKERHUB_REPO:$BUILD_IMAGE_ID"
+fi