Ensure we can run review-apps, even when they are globally disabled

Context

We can disable review-apps child pipelines in with the CI_REVIEW_APPS_ENABLED env variable.

We would still like to be able to test out review-apps in some MRs, to ensure that we fixed the problem that made us disable them in the first place.

What does this MR do?

Allow deployment of review-apps with the pipeline:run-review-app label, even when CI_REVIEW_APPS_ENABLED != true.

Proof of work

Currently, the CI_REVIEW_APPS_ENABLED env variable is set to false.

• Pipeline for this MR without the pipeline:run-review-app label: https://gitlab.com/gitlab-org/gitlab/-/pipelines/1091948332
  • The start-review-app-pipeline job is not present ✅
• Pipeline for this MR with the pipeline:run-review-app label: https://gitlab.com/gitlab-org/gitlab/-/pipelines/1091949048
  • The start-review-app-pipeline job is present 🎉

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.