Add check to prevent fixup commits from being merged #1

	name: 'Check Fixup Commits'
	description: 'Checks for commits containing "Fixup!"'
	inputs:
	token:
	description: 'GitHub Token'
	required: true
	runs:
	using: 'composite'
	steps:
	- name: Set up Git
	run: \|
	git fetch origin +refs/heads/:refs/remotes/origin/
	git config remote.origin.fetch "+refs/heads/:refs/remotes/origin/"
	git fetch --all

	- name: Check for Fixup Commits in Pull Request
	run: \|
	commits=$(git log origin/${{ github.event.pull_request.base.sha }}..origin/${{ github.event.pull_request.head.sha }} --oneline)
	if echo "$commits" \| grep -i "fixup!"; then
	echo "::warning file=,line=,col=::There are commits containing 'Fixup!'"
	exit 1
	fi
	shell: bash

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