Run scheduler task immediately

[RubenVP2]

Summary

• execute the scheduled job once on startup
• update scheduler unit test accordingly
• document the immediate execution in README
• allow targeting merge requests of a specific project

Testing

• pytest -q

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https://chatgpt.com/codex/tasks/task_e_6876a1eac6548333902d29eb3f4665ae

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.11%. Comparing base (be6bc5a) to head (7dbc703).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   93.68%   94.11%   +0.42%     
==========================================
  Files          23       23              
  Lines         507      527      +20     
  Branches       21       22       +1     
==========================================
+ Hits          475      496      +21     
+ Misses         21       20       -1     
  Partials       11       11              

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