Allow users to set pipeline expiry times per project and delete expired pipelines.
This won't work effectively with millions of projects, but that's expected. We want to see how popular this feature is before investing more time into building a robust solution.
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How to set up and validate locally
In rails console enable the experiment fully
Feature.enable(:ci_delete_old_pipelines)
Visit any project CI/CD settings pages such as http://127.0.0.1:3000/root/new-taggings/-/settings/ci_cd
Fill in Delete old pipelines with a desired value
Wait till the cron worker is executed(11 minutes tops).
