linux-doc: adapt, fix build #48204

	name: "Check whether nix files are parseable"

	permissions: read-all

	on:
	# avoids approving first time contributors
	pull_request_target:
	branches-ignore:
	- 'release-**'

	jobs:
	tests:
	runs-on: ubuntu-latest
	if: "github.repository_owner == 'NixOS' && !contains(github.event.pull_request.title, '[skip treewide]')"
	steps:
	- name: Get list of changed files from PR
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	gh api \
	repos/NixOS/nixpkgs/pulls/${{github.event.number}}/files --paginate \
	\| jq --raw-output '.[] \| select(.status != "removed" and (.filename \| endswith(".nix"))) \| .filename' \
	> "$HOME/changed_files"
	if [[ -s "$HOME/changed_files" ]]; then
	echo "CHANGED_FILES=$HOME/changed_files" > "$GITHUB_ENV"
	fi
	- uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
	with:
	# pull_request_target checks out the base branch by default
	ref: refs/pull/${{ github.event.pull_request.number }}/merge
	if: ${{ env.CHANGED_FILES && env.CHANGED_FILES != '' }}
	- uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
	with:
	nix_path: nixpkgs=channel:nixpkgs-unstable
	- name: Parse all changed or added nix files
	run: \|
	ret=0
	while IFS= read -r file; do
	out="$(nix-instantiate --parse "$file")" \|\| { echo "$out" && ret=1; }
	done < "$HOME/changed_files"
	exit "$ret"
	if: ${{ env.CHANGED_FILES && env.CHANGED_FILES != '' }}

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