feat: <support setting environment>

[sea-wyq]

Description

Does envd currently support setting environment variables? For example, LD_LIBRARY_PATH is necessary in some scenarios

Message from the maintainers:

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[VoVAllen]

Do you mean environment variable at runtime(docker run) or build time(docker build)?

[gaocegege]

SGTM, I think it is needed.

[gaocegege]

Do you mean environment variable at runtime(docker run) or build time(docker build)?

I think we can provide what dockerfile supports.

[aseaday]

It seems to be closed now