feat: add yamllint and fix yaml #3

	name: CI
	# yamllint thinks the `on` key is being turned into `true`
	# yamllint disable-line rule:truthy
	on: [push]

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go-version: [ '1.19', '1.20', '1.21.x' ]

	steps:
	- uses: actions/checkout@v4
	- name: Setup Go
	uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.go-version }}
	- name: Run tests
	run: go test -v .
	lint-yaml:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Lint YAML
	run: yamllint .

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