actually lint file on CI

[greizgh]

CI was producing this kind of messages:

[config_reader] The output format github-actions is deprecated, please use colored-line-number

(see https://github.com/juanfont/headscale/actions/runs/9994119669/job/27623152138#step:6:206)

This also restore golangci-lint action which was not properly linting files due to the extra . passed (we can expect it to fail if there are some non compliant files).

• have read the CONTRIBUTING.md file
• raised a GitHub issue or discussed it on the projects chat beforehand
• added unit tests
• added integration tests
• updated documentation if needed
• updated CHANGELOG.md

[kradalby]

hmm, I would have thought the github-actions to magically work nicely in github actions...

[greizgh]

hmm, I would have thought the github-actions to magically work nicely in github actions...

Do you mean the output format? It probably was, but is now deprecated.

[greizgh]

@kradalby if that's the disappearing . which troubles you, this is because directories are NOT analyzed recursively (cf quickstart). So we can either not specify the directory (as I did in this PR) or explicitly pass ./... for recursive check.
This single dot was the reason why the check never reported anything.