feat: Allow schemas to reference other schemas

[wedamija]

This allows us to reference external schemas to avoid duplication. They can be referenced like

"$ref": "file://uptime-results.v1.schema.json#/definitions/CheckResult"

The handler assumes all schemas will be located in out schemas directory.

Usage example here: #361

[wedamija]

I think that we likely need to do something to support this in rust as well - the tests seem less comprehensive there, so although they passed I doubt this works. Any thoughts on this @untitaker?

[untitaker]

(for both rust/python) how does get_schema behave? I think it will have to resolve all file refs and return a self-contained schema. it is used in consumers to validate.

[wedamija]

(for both rust/python) how does get_schema behave? I think it will have to resolve all file refs and return a self-contained schema. it is used in consumers to validate.

Python works after my changes - #361 has an example. I manually tested dropping fields from the examples and it validates successfully (ie test_examples fails if the schema is invalid). I'll try get a test going in rust

[untitaker]

@wedamija my bad, yeah i think if we can get some tests in rust that load all schemas like we have in python we'd be golden.

[wedamija]

@wedamija my bad, yeah i think if we can get some tests in rust that load all schemas like we have in python we'd be golden.

Ok, this is tested via the schema in #361. I can collapse these prs together if you prefer

[wedamija]

@wedamija my bad, yeah i think if we can get some tests in rust that load all schemas like we have in python we'd be golden.

Ok, this is tested via the schema in #361. I can collapse these prs together if you prefer

Hmm, looks like I missed something in the schema generation...