Add workflow to lint YAML files

[make-github-pseudonymous-again]

Together with #967, fixes #962.

[codecov[bot]]

Codecov Report

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

Project coverage is 65.86%. Comparing base (60ca4dd) to head (5a9a577).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #968 +/- ## ========================================== - Coverage 66.12% 65.86% -0.27% ========================================== Files 715 715 Lines 9893 9893 Branches 1346 1346 ========================================== - Hits 6542 6516 -26 - Misses 2888 2918 +30 + Partials 463 459 -4 ``` | [Flag](https://app.codecov.io/gh/infoderm/patients/pull/968/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=infoderm) | Coverage Δ | | |---|---|---| | [client](https://app.codecov.io/gh/infoderm/patients/pull/968/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=infoderm) | `46.23% <ø> (-0.27%)` | :arrow_down: | | [server](https://app.codecov.io/gh/infoderm/patients/pull/968/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=infoderm) | `61.87% <ø> (ø)` | | | [test](https://app.codecov.io/gh/infoderm/patients/pull/968/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=infoderm) | `71.97% <ø> (+0.01%)` | :arrow_up: | | [test-app](https://app.codecov.io/gh/infoderm/patients/pull/968/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=infoderm) | `53.70% <ø> (-0.32%)` | :arrow_down: | 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=infoderm#carryforward-flags-in-the-pull-request-comment) to find out more.

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