fix: port k8s perf fix #2449

	---
	name: "Notify on PRs from forks"

	on: # yamllint disable-line rule:truthy
	pull_request_target:
	branches:
	- main
	types:
	- opened

	jobs:
	notify-fork-prs:
	runs-on: ubuntu-latest
	steps:
	- name: Notify on PRs from forks
	id: notify-fork-prs
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	PR_URL: ${{ github.event.pull_request.html_url }}
	BASE_REPO: ${{ github.event.pull_request.base.repo.full_name }}
	HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
	USER: ${{ github.actor }}
	run: \|
	if [ "$BASE_REPO" = "$HEAD_REPO" ]; then
	echo "PR is from a branch on this repo."
	exit
	fi

	echo "PR is from $HEAD_REPO to $BASE_REPO by $USER."

	# Check if the user has write access to the repository. The HTTP status code for a
	# collaborator is 204 (which makes `gh` have exit code 0); for a non-collaborator, it is
	# 404 (exit code 1).
	if ! gh api "repos/$BASE_REPO/collaborators/$USER"; then
	echo "$USER does not have write access to $BASE_REPO."
	exit
	fi

	gh pr comment "$PR_URL" --body "This PR was opened from a forked repository. You should use a branch on the central repository instead."

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