test: Adds test suite for first endpoints

[frgfm]

This PR introduces the following modifications:

• fixes makefile order
• fixes edge cases of GitHub authorize
• adds telemetry on a few routes
• adds test for login route

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (4984f24) 17.23% compared to head (f63c82b) 72.74%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #19       +/-   ##
===========================================
+ Coverage   17.23%   72.74%   +55.51%     
===========================================
  Files          15       22        +7     
  Lines         325      554      +229     
===========================================
+ Hits           56      403      +347     
+ Misses        269      151      -118     

Flag	Coverage Δ
unittests	72.74% <50.00%> (+55.51%)	⬆️

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

Files	Coverage Δ
src/app/db.py	58.33% <100.00%> (+58.33%)	⬆️
src/app/api/api_v1/endpoints/repos.py	46.42% <0.00%> (ø)
src/app/api/api_v1/endpoints/login.py	65.30% <33.33%> (ø)

... and 18 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.