Add helm chart lint #3

	name: Lint helm chart

	on:
	pull_request:
	branches:
	- main

	jobs:
	lint:
	runs-on: ubuntu-latest
	permissions:
	contents: "read"
	id-token: "write"
	defaults:
	run:
	working-directory: helm/charts/playground-sandbox
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Helm
	uses: azure/setup-helm@v3
	with:
	version: v3.11.0

	# Python is required because `ct lint` runs Yamale (https://github.com/23andMe/Yamale) and
	# yamllint (https://github.com/adrienverge/yamllint) which require Python
	- uses: actions/setup-python@v5
	with:
	python-version: "3.9"
	check-latest: true

	- name: Set up chart-testing
	uses: helm/[email protected]

	- name: Run chart-testing (list-changed)
	id: list-changed
	run: \|
	changed=$(ct list-changed --config ct.yaml)
	if [[ -n "$changed" ]]; then
	echo "::set-output name=changed::true"
	fi

	- name: Run chart-testing (lint)
	run: ct lint --config ct.yaml

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