Support for Cabotage deployments

[JacobCoffee]

Initial support for migrating from Heroku (paid) to Cabotage (free)

Needs these set it cabo ui

• GH_SECRET
• GH_APP_ID
• GH_PRIVATE_KEY
• SENTRY_DSN
• REDIS_URL (new, replacing the Heroku-specific one)
• GH_AUTH

Will require disabling Heroku deploy -> enabling cabotage
it is ready @ https://cabotage.us-east-2.psfhosted.computer/projects/python/miss-islington/applications/miss-islington

Will also require Redis setup in k8s

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.11%. Comparing base (8a66b2f) to head (f9d99fc).

@@             Coverage Diff             @@
##              main     #729      +/-   ##
===========================================
- Coverage   100.00%   94.11%   -5.89%     
===========================================
  Files            6        8       +2     
  Lines          337      391      +54     
  Branches        12       13       +1     
===========================================
+ Hits           337      368      +31     
- Misses           0       23      +23     

Flag	Coverage Δ
Python_3.11	94.11% <100.00%> (-5.89%)	⬇️
Python_3.12	94.11% <100.00%> (-5.89%)	⬇️
Python_3.13	94.11% <100.00%> (-5.89%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
miss_islington/__main__.py	46.51% <100.00%> (ø)
tests/test___main__.py	100.00% <100.00%> (ø)
tests/test_backport_pr.py	100.00% <100.00%> (ø)
tests/test_delete_branch.py	100.00% <100.00%> (ø)

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