Disallow extra fields other than `"@context"` #811

	name: Test that old schemata are not modified

	on:
	pull_request:
	# Run whenever labels are modified, in addition to normal events:
	types: [opened, synchronize, reopened, labeled, unlabeled]

	jobs:
	test:
	runs-on: ubuntu-latest
	if: contains(github.event.pull_request.labels.*.name, 'release')
	steps:
	- name: Checkout this repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 0 # Need history for `git describe`
	path: dandischema

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.9'

	- name: Install dandischema
	run: python -m pip install .
	working-directory: dandischema

	- name: Checkout dandi/schema
	uses: actions/checkout@v4
	with:
	repository: dandi/schema
	path: schema

	- name: Test for unversioned changes
	run: \|
	dirs="$(echo releases/*)"
	echo "Following directories will be checked for differences: $dirs"
	python ../dandischema/tools/pubschemata.py releases
	git status
	git add -A releases
	if ! git diff --cached --exit-code $dirs
	then echo "[ERROR] Existing schema files modified instead of creating a new version"
	exit 1
	fi
	working-directory: schema

	# vim:set sts=2:

Provide feedback