Move to Spinach.

[jezdez]

Pull Request checklist

• Documentation: If this feature has or requires documentation, the relevant docs have been updated.
• Changelog: This PR updates the changelog with any user-visible changes.
• Tests: This PR includes thorough tests or an explanation of why it does not

[codecov]

Codecov Report

Merging #2381 into master will decrease coverage by 0.23%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2381      +/-   ##
==========================================
- Coverage   69.74%   69.51%   -0.24%     
==========================================
  Files         224      223       -1     
  Lines        5537     5451      -86     
  Branches      884      877       -7     
==========================================
- Hits         3862     3789      -73     
+ Misses       1650     1643       -7     
+ Partials       25       19       -6

Impacted Files	Coverage Δ
server/tests/test_file_update_operations.py	100% <100%> (ø)	⬆️
server/tests/settings.py	100% <100%> (ø)
server/files/tasks.py	100% <100%> (ø)	⬆️
server/files/api_views.py	85.71% <100%> (ø)	⬆️

[wlach]

@jezdez CI seems to be failing on this one...

[wlach]

Will take a closer look when unit tests passing

[wlach]

I tested this out and it works great. LGTM w/ comments addressed. Thanks so much for doing this! Also, could you squash this PR and give it a title like "Use Spinach task scheduler instead of Celery"?

[jezdez]

@wlach Would you mind looking at Heroku and see if the scheduler dyno is disabled correctly?

[wlach]

@wlach Would you mind looking at Heroku and see if the scheduler dyno is disabled correctly?

Yup, it's gone!