[build] add dev shim for coqidetop.opt. #1837

	name: "Check conflicts"
	on: [push]
	# Only on push because @coqbot already takes care of checking for
	# conflicts when PRs are opened or synchronized

	permissions:
	contents: read

	jobs:
	main:
	permissions:
	pull-requests: write
	runs-on: ubuntu-latest
	steps:
	- uses: eps1lon/actions-label-merge-conflict@b8bf8341285ec9a4567d4318ba474fee998a6919
	with:
	dirtyLabel: "needs: rebase"
	repoToken: "${{ secrets.GITHUB_TOKEN }}"

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