[27.x backport] image/list: Add `--tree` flag #5027

	name: validate

	# Default to 'contents: read', which grants actions to read commits.
	#
	# If any permission is set, any permission not included in the list is
	# implicitly set to "none".
	#
	# see https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
	permissions:
	contents: read

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	on:
	workflow_dispatch:
	push:
	branches:
	- 'master'
	- '[0-9]+.[0-9]+'
	tags:
	- 'v*'
	pull_request:

	jobs:
	validate:
	runs-on: ubuntu-24.04
	strategy:
	fail-fast: false
	matrix:
	target:
	- lint
	- shellcheck
	- validate-vendor
	- update-authors # ensure authors update target runs fine
	steps:
	-
	name: Checkout
	uses: actions/checkout@v4
	-
	name: Run
	uses: docker/bake-action@v5
	with:
	targets: ${{ matrix.target }}

	# check that the generated Markdown and the checked-in files match
	validate-md:
	runs-on: ubuntu-24.04
	steps:
	-
	name: Checkout
	uses: actions/checkout@v4
	-
	name: Generate
	shell: 'script --return --quiet --command "bash {0}"'
	run: \|
	make -f docker.Makefile mddocs
	-
	name: Validate
	run: \|
	if [[ $(git diff --stat) != '' ]]; then
	echo 'fail: generated files do not match checked-in files'
	git --no-pager diff
	exit 1
	fi

	validate-make:
	runs-on: ubuntu-24.04
	strategy:
	fail-fast: false
	matrix:
	target:
	- yamldocs # ensure yamldocs target runs fine
	- manpages # ensure manpages target runs fine
	steps:
	-
	name: Checkout
	uses: actions/checkout@v4
	-
	name: Run
	shell: 'script --return --quiet --command "bash {0}"'
	run: \|
	make -f docker.Makefile ${{ matrix.target }}

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