Fail CI if CONDA_FORGE_YAML_SCHEMA_FILE is out of date

[h-vetinari]

In a setup that was not obvious to me, the JSON under conda_smithy/data/conda-forge.json needs to be updated after every change to conda_smithy/schema.py.

CI should fail if the output of python conda_smithy/schema.py is not the same as the content under CONDA_FORGE_YAML_SCHEMA_FILE, c.f.

conda-smithy/conda_smithy/schema.py

Lines 1367 to 1379 in 41e3ac8

	if __name__ == "__main__":
	# This is used to generate the model dump for conda-smithy internal use
	# and for documentation purposes.
	model = ConfigModel()
	with CONDA_FORGE_YAML_SCHEMA_FILE.open(mode="w+") as f:
	obj = model.model_json_schema()
	f.write(json.dumps(obj, indent=2))
	f.write("\n")
	with CONDA_FORGE_YAML_DEFAULTS_FILE.open(mode="w+") as f:
	f.write(yaml.dump(model.model_dump(by_alias=True), indent=2))