ci: update gitlab ci

[jooola]

• Only run on feature branches
• Use shared cache
• Update jobs to latest best practices

[codecov[bot]]

Codecov Report

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

Project coverage is 71.54%. Comparing base (23b6419) to head (00204a1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #482 +/- ## ========================================== - Coverage 71.59% 71.54% -0.06% ========================================== Files 45 45 Lines 3876 3876 ========================================== - Hits 2775 2773 -2 - Misses 689 690 +1 - Partials 412 413 +1 ```

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