[Terraform] github_branch_protection.required_status_checks.contexts are missing

[jneo8]

Right now we are missing github_branch_protection.required_status_checks.contexts on github repo settings.

contexts is empty by default; ie. no status checks are required to pass even if required_status_checks is turned on.

We need to set a value per-repository.

[aieri]

@jneo8 is this necessary even for projects that use the public runners?

[jneo8]

The contexts are list of checks you need to pass before merge into protected branch.
This issue is more like a reminder for us to reach a consensus: do we want it or not?

Strictly speaking we may need it for security reason but since we have been not set it up for a long time and we have two approval required rule so I think maybe not.