Make `git_url` optional :raccoon:

[jamacku]

default value is ${{ github.server_url }}/${{ github.repository }}

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.33%. Comparing base (f965d7f) to head (e3c5f93).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #189 +/- ## ======================================= Coverage 88.33% 88.33% ======================================= Files 10 10 Lines 686 686 Branches 72 72 ======================================= Hits 606 606 Misses 78 78 Partials 2 2 ```

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[zmiklank]

[test]