add arm64 to docker publish workflow

.github/workflows/docker.yml

@@ -1,6 +1,5 @@
 name: Docker Build and Push
-# Build & Push builds the simapp docker image on every push to master
-# and pushes the image to https://hub.docker.com/u/provenanceio
+
 on:
   push:
     branches:
@@ -9,11 +8,6 @@ on:
       - "v[0-9]+.[0-9]+.[0-9]+" # Push events to matching v*, i.e. v1.0, v20.15.10
       - "v[0-9]+.[0-9]+.[0-9]+-rc*" # Push events to matching v*, i.e. v1.0-rc1, v20.15.10-rc5
 
-# Set concurrency for this workflow to cancel in-progress jobs if retriggered.
-# The github.ref is only available when triggered by a PR so fall back to github.run_id for other cases.
-# The github.run_id is unique for each run, giving each such invocation it's own unique concurrency group.
-# Basically, if you push to a PR branch, jobs that are still running for that PR will be cancelled.
-# But jobs started because of a merge to main or a release tag push are not cancelled.
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true
@@ -25,13 +19,16 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+
       - name: Setup go
         uses: actions/setup-go@v4
         with:
           go-version: '1.20'
+
       - name: Go mod vendor
         run: |
          go mod vendor
+
       - name: Prepare
         id: prep
         run: |
@@ -56,24 +53,28 @@ jobs:
           created="$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
           echo "Setting output: created=$created"
           echo "created=$created" >> "$GITHUB_OUTPUT"
+
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v3
+
       - name: Available platforms
         run: echo ${{ steps.buildx.outputs.platforms }}
+
       - name: Login to DockerHub
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Publish to Docker Hub
         uses: docker/build-push-action@v5
         with:
           context: .
           target: run
           build-args: |
             VERSION=${{ steps.prep.outputs.version }}
-          platforms: linux/amd64
+          platforms: linux/amd64,linux/arm64
           file: docker/blockchain/Dockerfile
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.prep.outputs.tags }}