Make developing/debugging/testing more efficient for developer

[lhw362950217]

After our code refactory, only workflow mode is officially supported. This makes the developing and debugging more complicated. The complication comes from ways:

1. Many docker images (dev, ci, server, step...) are involved, building images always costs time.
2. Workflow will run in a k8s cluster, the internal status of the program is not easy to expose.
3. Modify code and re-deploy need many steps, which takes a lot of time.
4. Not enough guide for develop/debug/ci/customize model/build runnable.

After some discussion with other developers, I conclude the following refinement todo, most of them are doc modifications:

1. Developer guide
   • Local developing environment deploy guide
   • How to build relative images
   • How to do unit-test in our ci image
   • How to do e2e test in local playground, (like how to sharing code with VM, how to submit a test program to the cluster)
   • How to re-deploy component in local playground
   • How to release a version
2. Update model contribution doc
3. Write runnable building doc
4. Speed up docker image pulling
5. Refine our image Dockerfile, make re-build faster