Merge #3044

3044: docs: Record how to establish bors persmissions r=nfrisby a=nfrisby

We've had to track down our notes about how to complete this onboarding step more than once now, so I'm recording it in the place where at least the new person will be looking :)

Co-authored-by: Nicolas Frisby <nick.frisby@iohk.io>

ouroboros-consensus/docs/IOHKOnboarding.md

@@ -45,7 +45,12 @@ You'll eventually also need to be in the `CODEOWNERS` file.
 * Commit, push and make a PR
 * Find some one to review it by the end of the day
 * Merge it! - note that we use `bors` to merge our PRs
-
+    * Issuing `bors` commands requires certains permissions.
+    * First, someone with permissions to do so must give you write access in
+      [the repository
+      settings](https://github.com/input-output-hk/ouroboros-network/settings/access).
+    * Then, someone with permissions to do so must click the "Update" in [the
+      `bors` settings](https://bors-ng.aws.iohkdev.io/repositories/8/settings).
 
 The general IOHK onboarding should have discussed establishing hardware-based
 Two Factor Authentication on your GitHub account; that's another prerequisite.