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Add lint check for workshop material (trial) #2

	# Checks that workshop material can be opened: notebooks are valid, scripts parse.
	# Runs with a read-only token and no secrets, so it is safe for pull requests from forks.
	name: Lint workshop material

	on:
	pull_request:
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	# The pull request merge commit and its first parent (the base branch)
	fetch-depth: 2

	- uses: actions/setup-python@v5
	with:
	python-version: "3.12"

	- name: Install linter dependencies
	run: pip install --quiet nbformat pyyaml

	- name: Select files
	id: select
	env:
	EVENT: ${{ github.event_name }}
	run: \|
	if [ "$EVENT" = "pull_request" ]; then
	scope="--changed-since HEAD^1"
	else
	scope="--all"
	fi
	echo "scope=$scope" >> "$GITHUB_OUTPUT"
	python .github/scripts/lint_workshop.py $scope --print-files \| tee files.txt
	if grep -qiE '\.(r\|rmd\|qmd)$' files.txt; then
	echo "needs_r=true" >> "$GITHUB_OUTPUT"
	fi
	rm files.txt

	- name: Set up R
	if: steps.select.outputs.needs_r == 'true'
	uses: r-lib/actions/setup-r@v2

	- name: Lint
	run: python .github/scripts/lint_workshop.py ${{ steps.select.outputs.scope }} --github