do not require installed Flux for `pip download flux-python`

[grondo]

A user is trying to download the flux-python pip package to stash in a repository of packages for CI. However, they're hitting the issue

$ pip download flux-python
 
This fails with:
 
× python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      Cannot find executable flux, which is required to be on PATH to find the install location.
      [end of output]

I'm afraid I don't know enough about pip to determine if this could be fixed/worked around. Any ideas @vsoch ?

[vsoch]

They should try to download and install a wheel directly.

[grondo]

If you give an example of what that means, I can share it with the user. Thanks!

[grondo]

Oh, I see you answered in the email thread. Thanks!