Merge torrust#101: Add code owners for GitHub workflows

08f0aac chore: add code owners for github workflows (Jose Celano)

Pull request description:

  @da2ce7 @josecelano @WarmBeer get notified when a PR changes the `.github` dir content.

  @WarmBeer, we should also enable required reviews for PR and require approval from a code owner before the author can merge a pull request in the repository.

  _"Optionally, you can choose to require reviews from code owners. If you do, any pull request that affects code with a code owner must be approved by that code owner before the pull request can be merged into the protected branch."_

  See: https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/defining-the-mergeability-of-pull-requests/about-protected-branches#require-pull-request-reviews-before-merging

  I don't have permission to do it.

ACKs for top commit:
  josecelano:
    ACK 08f0aac

Tree-SHA512: 7363b774c7822a1fc7a25147c14de977f97dd9aa347ca08cf671659f733b25b684c04cd252841b465de8bdd2656b4d3cc82f3ddff3fed15336885a56ec15edbc

CODEOWNERS

@@ -0,0 +1 @@
+/.github/ @da2ce7 @josecelano @WarmBeer