By default, Digger ignores Draft pull requests. You can enable support of draft PRs by setting allow_draft_prs flag in digger.yml: 
  allow_draft_prs: true

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Unlocking on changing back to draft

When a PR changes status from “ready to review” back to “draft”:
  • if allow_draft_prs is false, digger will release the lock
  • if allow_draft_prs is true, digger will not do anything (because it’s considered a PR like any other)