Add some hardening to the build script. Check if system has docker bu… #972

	name: "Check for merge conflicts"
	on:
	# So that PRs touching the same files as the push are updated
	push:
	# So that the `dirtyLabel` is removed if conflicts are resolve
	# We recommend `pull_request_target` so that github secrets are available.
	# In `pull_request` we wouldn't be able to change labels of fork PRs
	pull_request_target:
	types: [synchronize]

	jobs:
	main:
	runs-on: ubuntu-latest
	steps:
	- name: Check if PRs are have merge conflicts
	uses: eps1lon/actions-label-merge-conflict@v3.0.2
	with:
	dirtyLabel: "Merge Conflict"
	repoToken: "${{ secrets.GITHUB_TOKEN }}"
	commentOnDirty: "This pull request has conflicts, please resolve those before we can evaluate the pull request."
	commentOnClean: "Conflicts have been resolved."

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