add a workflow to checkout a branch of a repo. #1

	name: Check out a branch of an external repo.

	on:
	workflow_call:
	inputs:
	repository:
	description: The repo to check out.
	required: true
	default: "@collaborators/push"
	type: string
	branch:
	description: The branch to check out.
	required: true
	default: "@collaborators/push"
	type: string

	jobs:
	deploy:
	runs-on: ubuntu-latest
	timeout-minutes: 30
	permissions:
	contents: read # to fetch code (actions/checkout)
	deployments: write # to delete deployments
	pull-requests: write # to remove labels
	statuses: write # to create commit status
	outputs:
	PULLPREVIEW_URL: ${{ steps.pullpreview.outputs.url }}
	PULLPREVIEW_HOST: ${{ steps.pullpreview.outputs.host }}
	PULLPREVIEW_USERNAME: ${{ steps.pullpreview.outputs.username }}

	steps:
	- name: Checkout GitHub repository
	if: ${{ contains(github.event.pull_request.labels.*.name, 'differ') && github.event.action != 'unlabeled' && github.event.action != 'closed' }}
	# https://github.com/actions/checkout
	uses: actions/checkout@v4
	with:
	repository: "${{ inputs.repository }}"
	ref: "${{ inputs.branch }}"
	run: \|
	git checkout -b "${{ inputs.branch }}"
	git commit "inital commit"
	git push

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