add script to generate Schemastore's schema for rockcraft.yaml #6

	name: schema
	on: [pull_request]

	jobs:
	generate-schema:
	runs-on: ubuntu-22.04

	steps:
	- name: Checkout rockcraft
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.10'

	- name: Install requirements
	run: pip install -r requirements.txt

	- name: Run generator script
	run: python .github/scripts/schema.py > generated_schema.json

	- name: Check with stored schema
	run: diff generated_schema.json schemas/rockcraft_schema.json > /dev/null

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