Enable or disable repo_locking per repo in repos.yaml and atlantis.yaml

[krrrr38]

What did I change?

• add repo_locking setting in repo config and atlantis.yaml.
• allow override repo_locking by atlantis.yaml
• ProjectLocker has NoOpLocker and TryLock check repoLocking bool arg.
  • if repoLocking is false, ProjectLocker doesn't get a lock using NoOpLocker

Check

I just add some unit tests and check manually in krrrr38/atlantis-debug#1 and krrrr38/atlantis-debug#2.

In this case, I use the following repo config which contains allowed_overrides: [repo_locking].

export ATLANTIS_REPO_CONFIG_JSON='{"repos":[{"id":"/.*/", "allowed_overrides": ["repo_locking"], "apply_requirements":["mergeable"]}]}'

And put atlantis.yaml which contains repo_locking: false.

version: 3
projects:
- name: project
  branch: /master/
  dir: .
  repo_locking: false

then, plan works in the 2 PR without any lock.

Closes #1391

[nitrocode]

Thank you @krrrr38 for addressing the feedback.

@jamengual and the other maintainers have locked the main branch for now in order to finish the 0.21.0 release. After that is released by EOW, we'll open up new changes to the default branch again.

[nitrocode]

Unsure why the tests are failing but it does not seem relevant to this PR.

[nitrocode]

cc: @jamengual please review if you a some time since there have been changes. If you're good, then I'm ok with this as well

[nitrocode]

Verbal agreement from @jamengual in slack. Merging!

[nitrocode]

Thank you @krrrr38 for the contribution!

[nitrocode]

@krrrr38 let us know if you're interested in becoming a maintainer. We're looking for more maintainers with high quality PRs who are interested in keeping atlantis in a well-maintained state.

[krrrr38]

@nitrocode Sounds good to me. I'm not sure to support how much time I can spend, but I can focus on Atlantis a little bit more when I become a maintainer. I will use terraform and atlantis for a while in the future, cause this is a great product which supports continuous delivery with git-* flow. So I'm happy to contribute atlantis.
If require more contributions or reviews to become it, I will try it. Thanks.