Help does not display env name when configured for a parameter

[GMZwinge]

Do you want to request a feature or report a bug?

Feature

Similar to how flags default are displayed in the help for a command, the help could also display the name of the environment variable when configured for a flag.

What is the current behavior?

bin\run <command> --help displays for each flags the default if configured, eg:

--my-flag=my-flag    [default: my-default] Flag for ...

To find out the environment variable name that can be used instead of a flag, one must look at the code, or add manually the variable name to the flag's help.

What is the expected behavior?

Help could include the name of the environment variable, eg something like this:

--my-flag=my-flag    [default: my-default, env: MY_FLAG] Flag for ...

[whalemare]

Bump, really useful feature

[git2gus]

This issue has been linked to a new work item: W-15161040