docker: release Linux/ARM64 image (#5925)

Co-authored-by: Marko <marbar3778@yahoo.com>

.github/workflows/docker.yml

@@ -14,9 +14,6 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v2
-        with:
-          go-version: "1.15"
       - uses: actions/checkout@master
       - name: Prepare
         id: prep
@@ -37,6 +34,11 @@ jobs:
           fi
           echo ::set-output name=tags::${TAGS}
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: all
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
@@ -47,14 +49,11 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build Tendermint
-        run: |
-          make build-linux && cp build/tendermint DOCKER/tendermint
-
       - name: Publish to Docker Hub
         uses: docker/build-push-action@v2
         with:
-          context: ./DOCKER
+          context: .
           file: ./DOCKER/Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.prep.outputs.tags }}

DOCKER/Dockerfile

@@ -1,4 +1,14 @@
-FROM alpine:3.9
+# stage 1 Generate Tendermint Binary
+FROM golang:1.15-alpine as builder
+RUN apk update && \
+    apk upgrade && \
+    apk --no-cache add make
+COPY / /tendermint
+WORKDIR /tendermint
+RUN make build-linux
+
+# stage 2
+FROM golang:1.15-alpine
 LABEL maintainer="hello@tendermint.com"
 
 # Tendermint will be looking for the genesis file in /tendermint/config/genesis.json
@@ -29,15 +39,14 @@ EXPOSE 26656 26657 26660
 
 STOPSIGNAL SIGTERM
 
-ARG BINARY=tendermint
-COPY $BINARY /usr/bin/tendermint
+COPY --from=builder /tendermint/build/tendermint /usr/bin/tendermint
 
 # You can overwrite these before the first run to influence
 # config.json and genesis.json. Additionally, you can override
 # CMD to add parameters to `tendermint node`.
 ENV PROXY_APP=kvstore MONIKER=dockernode CHAIN_ID=dockerchain
 
-COPY ./docker-entrypoint.sh /usr/local/bin/
+COPY ./DOCKER/docker-entrypoint.sh /usr/local/bin/
 
 ENTRYPOINT ["docker-entrypoint.sh"]
 CMD ["start"]