Move CI to Github Actions

[c-w]

See #463

[codecov-commenter]

Codecov Report

Merging #467 into master will increase coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #467      +/-   ##
==========================================
+ Coverage   76.21%   76.71%   +0.50%     
==========================================
  Files          45       45              
  Lines        2766     2766              
==========================================
+ Hits         2108     2122      +14     
+ Misses        658      644      -14     

Impacted Files	Coverage Δ
opwen_email_client/webapp/mkwvconf.py	100.00% <0.00%> (+38.88%)	⬆️

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