chore: enable multi-platform Docker builds via buildx

Author: chenby

.github/workflows/docker.yml

@@ -8,6 +8,7 @@ jobs:
  runs-on: ubuntu-latest
 
  steps:
+ - uses: actions/checkout@v4
  - name: Create Tag
  run: |
  echo "RELEASE_TAG=`cat ./src/main/resources/.version`" >> $GITHUB_ENV