Add golangci-lint as separate job

[codecov-commenter]

Codecov Report

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

Comparison is base (c567987) 52.14% compared to head (597bee7) 52.14%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #458 +/- ## ======================================= Coverage 52.14% 52.14% ======================================= Files 159 159 Lines 8384 8384 ======================================= Hits 4372 4372 Misses 3789 3789 Partials 223 223 ``` | [Flag](https://app.codecov.io/gh/bio-routing/bio-rd/pull/458/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bio-routing) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/bio-routing/bio-rd/pull/458/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bio-routing) | `52.14% <ø> (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=bio-routing#carryforward-flags-in-the-pull-request-comment) to find out more.

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