Add GAFF-based example back #38

	name: Generate PR cache by copying main

	on:
	pull_request:
	types:
	- opened
	- reopened
	branches:
	- main

	jobs:
	preprocess:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout deployment branch
	uses: actions/checkout@v3
	with:
	ref: _cookbook_data_main
	clean: false

	- name: Copy cache from main to PR branch
	shell: bash -l {0}
	run: \|
	git config user.name github-actions
	git config user.email [email protected]
	git push origin HEAD:_cookbook_data_PR${{ github.event.number }}

	- name: Add descriptive comment to PR
	uses: thollander/actions-comment-pull-request@v2
	with:
	message: >
	This repository caches data generated from notebooks stored in other
	repositories in the `_cookbook_data_*` branches. Regenerating this
	cache takes about half an hour, so it is not done automatically in
	PRs. The current value of the cache from the `main` branch has been
	copied over to this PR's cache.


	To regenerate the cache for this PR, create a comment on this PR
	consisting only of the string:


	```

	/regenerate-cache

	```

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