* since we do the image build in initialize container of pod, so we have to make sure the image built can be access from kubelet on same node, containerd could not support that
* update docs
* bump version
* clean up
* * 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
