* * image build in cluster now
use InitContainer to do the image building inside pods, which invoke
docker again node's docker daemon
* create a docker build image tool fx/contrib/docker_packer
* clean up no need env in GitHub action workflow
* bump version
* fx image build, build a function into a image which a API service handle with function
* fx image export, export service into a directory, for easy debug, we
can just go the directory to do everything with Docker cli
