Support YAML anchors for static files

[snazy]

OpenApiProcessor uses Jackson, which does not support YAML anchors.

(OpenAPITools sample, Jackson issue (stale))

It would be possible to support YAML anchors directly in smallrye-open-api by "preprocessing" a YAML file with snakeyaml.

I'm not sure how much appetite there is to have this kind of change. IMO if it's added to smallrye-open-api, then it should be hidden behind a toggle at least, or better using another io.smallrye.openapi.runtime.io.Format type.

The cleaner solution would probably be to add support for YAML anchors to Jackson.

[MikeEdgar]

@snazy thanks for opening this. Is the expectation that the anchors would be supported when reading a static file, but not present in the final OpenAPI model -- since they would be lost in the object structure after de-serializing?

[snazy]

It would be fine for us to lose the anchors in the generated output, I can only speak for "projectnessie" though.