Create cron job to re-give superuser to env-defined users

[julianweng]

Due to apparently broken team sync steps on the platform side, various administrators from OSA have found their permissions reset on a daily to weekly basis. This PR creates a (very) temporary, naive solution by busy-waiting and changing their permissions back to super-user on a regular basis (I'm not sure if team sync calls Clubs serializers to update users so subscribing to team sync changes might not be feasible).

To work in production, define an environment variable OSA_KEYS with a comma-separated list of valid PennKeys to enforce superuser on.

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.90%. Comparing base (109c44c) to head (02439d2).

Files with missing lines	Patch %	Lines
...end/clubs/management/commands/osa_perms_updates.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #742      +/-   ##
==========================================
+ Coverage   71.80%   71.90%   +0.09%     
==========================================
  Files          31       32       +1     
  Lines        6901     6929      +28     
==========================================
+ Hits         4955     4982      +27     
- Misses       1946     1947       +1     

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