fast-import: avoid making replace refs point to themselves #4756

	name: check-whitespace

	# Get the repository with all commits to ensure that we can analyze
	# all of the commits contributed via the Pull Request.
	# Process `git log --check` output to extract just the check errors.
	# Exit with failure upon white-space issues.

	on:
	pull_request:
	types: [opened, synchronize]

	# Avoid unnecessary builds. Unlike the main CI jobs, these are not
	# ci-configurable (but could be).
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	check-whitespace:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: git log --check
	id: check_out
	run: \|
	./ci/check-whitespace.sh \
	"${{github.event.pull_request.base.sha}}" \
	"$GITHUB_STEP_SUMMARY" \
	"https://github.com/${{github.repository}}"

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