feat: make published Docker images multi-platform, add linux/arm64 pl…

…at (#4058)

Closes: #4038

.github/workflows/release.yml

@@ -27,6 +27,11 @@ jobs:
         with:
           node-version: 'v16.20.2'
 
+      # Setup a Docker "buildx" builder container, used by "build-push-action"
+      # below for multi-platform image builds. Notes on multi-platform images:
+      # https://github.com/elastic/apm-agent-nodejs/issues/4038#issuecomment-2130406402
+      - uses: docker/setup-buildx-action@v3
+
       - name: Log in to the Elastic Container registry
         uses: docker/login-action@0d4c9c5ea7693da7b068278f7b52bda2a190a446 # v3.2.0
         with:
@@ -61,6 +66,7 @@ jobs:
         uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0  # v5.3.0
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           file: 'Dockerfile'
           push: true
           tags: ${{ steps.docker-meta.outputs.tags }}
@@ -94,6 +100,7 @@ jobs:
         uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0  # v5.3.0
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           file: 'Dockerfile.wolfi'
           push: true
           tags: ${{ steps.docker-meta-wolfi.outputs.tags }}

CHANGELOG.asciidoc

@@ -42,13 +42,20 @@ See the <<upgrade-to-v4>> guide.
 [float]
 ===== Features
 
+* Make published `docker.elastic.co/observability/apm-agent-nodejs` Docker
+  images multi-platform, with support for `linux/amd64,linux/arm64` for now.
+  This is necessary for users of the Elastic APM Attacher for Kubernetes,
+  when deploying to k8s nodes that are ARM64 (e.g. Gravitron on AWS).
+  ({issues}4038[#4038])
+
 [float]
 ===== Bug fixes
 
 * Fix instrumentation for recent `@aws-sdk/client-*` releases that use
   `@smithy/smithy-client` v3. (For example `@aws-sdk/client-s3@3.575.0` released
   2024-05-13 updated to smithy-client v3.) Before this change the APM agent had
   been limiting patching of `@smithy/smithy-client` to `>=1 <3`.
+  ({pull}4036[#4036])
 
 * Mark the published AWS Lambda layers as supporting the "nodejs20.x" Lambda
   Runtime (`--compatible-runtimes`). The "nodejs20.x" runtime was released by