fix(#20): add github action for codecov

[Derane]

Description

add github action for codecov

Related Issue

https://github.com/VilnaCRM-Org/user-service/issues/20

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] I have performed a self-review of my code.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [x] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING.md document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [x] You have only one commit (if not, squash them into one commit).

[codecov[bot]]

Codecov Report

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

Please upload report for BASE (main@3f73387). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #21 +/- ## ======================================== Coverage ? 100.00% Complexity ? 503 ======================================== Files ? 141 Lines ? 2249 Branches ? 0 ======================================== Hits ? 2249 Misses ? 0 Partials ? 0 ``` | [Flag](https://app.codecov.io/gh/VilnaCRM-Org/user-service/pull/21/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VilnaCRM-Org) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/VilnaCRM-Org/user-service/pull/21/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VilnaCRM-Org) | `100.00% <ø> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=VilnaCRM-Org#carryforward-flags-in-the-pull-request-comment) to find out more.

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