feat(lang): Extend envd build process to help system administrators customize

[gaocegege]

Description

MLOps teams may want to install some pre-built dependencies like internal SDKs, SSH keys or other things in the image. But it is hard to do it in base image since there may be so many images to support.

It would be great if we can support administrators writing logic to customize the build process:

Approach 1

config.envd:

load("predefined.envd")
...

Approach 2

envd context create --load predefined.envd

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[gaocegege]

dup with #559

[gaocegege]

/close

[gaocegege]

/reopen

[muniu-bot]

@gaocegege: Reopened this issue.

In response to this:

/reopen

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[gaocegege]

/close

[muniu-bot]

@gaocegege: Closing this issue.

In response to this:

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.