feat(lang): Support local-shell

[gaocegege]

Description

It will be great to support running some shell scripts during the build process.

def get_kube_nodes(name):
    ip = local-shell("kubectl get nodes -o=jsonpath='{range .items[*]}{.metadata.name}{":"}{.status.addresses[?(@.type=="InternalIP")].address}{"\n"}{end}'")

Ref https://api.tilt.dev/core/cmd-v1alpha1.html#Cmd

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[kemingy]

I think it can be done by https://github.com/tensorchord/envd/issues/825

[gaocegege]

I think these are two different features. #825 provides CLI arguments in envd up.

[kemingy]

It's much more flexible to do it in a shell and pass the result as an argument. Also, it's easier to debug in the shell.

[gaocegege]

I understand your opinion here.