Small tune ups to formatting of JSONs and use .jsonld not .prov #3803

	name: Lint yml files

	on: [push, pull_request]

	jobs:
	yml-lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v1
	with:
	python-version: 3.9
	- name: Install dependencies
	run: pip install yamllint
	- name: Lint yml files in src/schema
	# for config, see:
	# https://yamllint.readthedocs.io/en/stable/configuration.html#custom-configuration-without-a-config-file
	run: \|
	yamllint -f standard src/schema/ -c .yamllint.yml

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