Route prefix is ignored on registration

[sersorrel]

Here, the API routes appear to be added directly to /:

softpack-core/softpack_core/app.py

Lines 67 to 69 in 13132b4

	def include_router() -> None:
	return self.router.include_router(api.router)

so ServiceAPI.upload_artifacts ends up at /upload (rather than /service/upload).

I would expect api.prefix to be used there somewhere.

API.url() is unused, but appears to also expect prefix to be used:

softpack-core/softpack_core/api.py

Line 50 in 13132b4

return app.url(path=str(Path(cls.prefix) / path))

[sersorrel]

...however, test code expects the current URL:

softpack-core/tests/integration/test_builderupload.py

Line 36 in 13132b4

url="/upload?" + env_path,