GitHub/Backup: Add wrapper around github-backup

[amotl]

About

Wrapping github-backup into rapporto gh backup.

• GitHub Backups #18

Documentation

• https://rapporto--22.org.readthedocs.build/guide/github.html#backup

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.92%. Comparing base (36cb148) to head (0601084).
Report is 74 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   71.25%   71.92%   +0.67%     
==========================================
  Files          11       12       +1     
  Lines         668      684      +16     
==========================================
+ Hits          476      492      +16     
  Misses        192      192              

Flag	Coverage Δ
unittests	71.92% <100.00%> (+0.67%)	⬆️

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