Automate keeping reviewers list up-to-date

[lbernick]

We should introduce automation to help us add new reviewers to the org who are meeting reviewer requirements based on the contributor ladder, and move inactive reviewers to alumni if they meet the criteria for inactive reviewers. Org updates should go through human review and notify the contributors involved, but we should create automation for proposing changes.

Adding new reviewers is important because it encourages contributors to grow their contributor status, spreads the load among reviewers, and removes the awkwardness of "nominating" yourself for increased privileges. Removing inactive reviewers is important because it helps prevent PRs from going unreviewed and granting overly lax permissions on our repos.

The best place to start would be modifying https://gist.github.com/dibyom/83651e34488aa3acaf38be4e1ba80e45 and https://gist.github.com/afrittoli/8aa0e878a87652f785bb9e5ec4c98400 to create a script in the community repo that can print out suggested new reviewers and suggested alumni. (Note: GitHub contributions summaries are already publicly available on the contributor dashboard).

After this, we could optionally try automating running the script on a ~ monthly basis for the Pipelines repo and publishing the results somewhere visible to Pipelines maintainers (e.g. a slack channel or just opening a PR directly).

[tekton-robot]

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[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle rotten

Send feedback to tektoncd/plumbing.

[vdemeester]

/remove-lifecycle rotten

[tekton-robot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale with a justification.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle stale

Send feedback to tektoncd/plumbing.

[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle rotten

Send feedback to tektoncd/plumbing.