Update automerger template and documentation

We cannot skip running actions for regular users here, it results in the
checks all being reset without any way to then make them run.

Author: bnbarham

.github/workflows/create_automerge_pr.yml

@@ -33,12 +33,13 @@ name: Create automerge PR
 # ```
 #
 # PRs created by GitHub Actions don't kick off further actions (https://github.com/peter-evans/create-pull-request/blob/d57e551ebc1a16dee0b8c9ea6d24dba7627a6e35/docs/concepts-guidelines.md#triggering-further-workflow-runs).
-# As a workaround, we mark automerge PRs that are created by GitHub actions as draft and trigger the GitHub actions by marking the PR as ready for review. But we don't want to re-trigger testing this when a normal user's PR is marked as ready for review.
-# For this the pull request workflow in the repository needs to add the `ready_for_review` type to its `pull_request` trigger and add the following condition as an `if` condition to all jobs:
-#
+# As a workaround, we mark automerge PRs that are created by GitHub actions as draft and trigger the GitHub actions by marking the PR as ready for review. `ready_for_review` must be added to the PR types for this purpose, eg.
 # ```
-# if: (github.event.action != 'ready_for_review') || (github.event.action == 'ready_for_review' && github.event.pull_request.user.login == 'github-actions[bot]')
+# on:
+#  pull_request:
+#    types: [..., ready_for_review]
 # ```
+# Unfortunately this will also re-trigger testing evenon a normal user's PR (which may have already been tested), but skipping them causes the checks to reset so this is the best we can do for now.
 on:
   workflow_call:
     inputs: