Github Actions: autoformat with black

[annabel48lin]

#295 Enforce code style with flake8 and black

• [black] During the workflow, we now autoformat the code and push.
• [flake8] There is also commented out code for linting with flake8, but there are currently too many errors and warnings that we need to fix, so it is not part of our workflow yet

Created issue #308: Fix errors and warnings from flake8 and add to workflow

[codecov]

Codecov Report

Merging #307 (bffe1c5) into master (cc40815) will not change coverage.
The diff coverage is 81.53%.

❗ Current head bffe1c5 differs from pull request most recent head b2ce8e5. Consider uploading reports for the commit b2ce8e5 to get more accurate results

@@           Coverage Diff           @@
##           master     #307   +/-   ##
=======================================
  Coverage   89.56%   89.56%           
=======================================
  Files          29       29           
  Lines        3047     3047           
=======================================
  Hits         2729     2729           
  Misses        318      318           

Impacted Files	Coverage Δ
aguaclara/core/cache.py	94.28% <0.00%> (ø)
aguaclara/core/materials.py	100.00% <ø> (ø)
aguaclara/design/cdc.py	96.07% <0.00%> (ø)
aguaclara/design/plant.py	63.15% <ø> (ø)
...clara/research/environmental_processes_analysis.py	40.19% <17.07%> (ø)
aguaclara/design/component.py	42.10% <25.00%> (ø)
aguaclara/core/head_loss.py	70.33% <54.54%> (ø)
aguaclara/design/pipeline.py	71.65% <55.17%> (ø)
aguaclara/core/units.py	81.81% <60.00%> (ø)
aguaclara/design/floc.py	90.24% <66.66%> (ø)
... and 19 more

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[HannahSi]

Nice job on getting black to work! It looks like the Github Action you linked in psf's repo can be used as a third-party action, at least from a glance at the Github Actions section of the repo's readme. That could it more concise and easy to configure and less redundant. Would you be able to try that out?
Also, if you ever want to look up other actions you can check out the Github Marketplace!

[HannahSi]

I think you can avoid using a personal account with a bot account like in the docs workflow. But hopefully that isn't necessary with a pre-packaged action for using black!