ci: add Github Actions workflow to run checks #4

	name: validate
	on: [push]

	jobs:
	check:
	runs-on: ubuntu-latest
	environment: validate-${{matrix.environment}}
	strategy:
	matrix:
	environment: ["staging", "firefoxci"]
	env:
	TASKCLUSTER_ROOT_URL: ${{vars.TASKCLUSTER_ROOT_URL}}
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	cache: pip
	- name: Install dependencies
	run: pip install -r requirements/test.txt
	- name: Run checks
	run: tc-admin check --environment ${{matrix.environment}}

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