ci: build arm64 and amd64 container images for ci images (#1036)

.github/workflows/ci.yml

@@ -59,6 +59,7 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: true
           build-args: |
             COMMIT_TAG=${{ github.sha }}

Dockerfile

@@ -1,11 +1,20 @@
 FROM node:14.16-alpine AS BUILD_IMAGE
 
+ARG TARGETPLATFORM
+ENV TARGETPLATFORM=${TARGETPLATFORM:-linux/amd64}
+
 ARG COMMIT_TAG
 ENV COMMIT_TAG=${COMMIT_TAG}
 
 COPY . /app
 WORKDIR /app
 
+RUN \
+  case "${TARGETPLATFORM}" in \
+    'linux/arm64') apk add --no-cache python make g++ ;; \
+    'linux/arm/v7') apk add --no-cache python make g++ ;; \
+  esac
+
 RUN yarn --frozen-lockfile && \
   yarn build