Add config API endpoint to Open API specs

[Anders Eknert]

The config endpoint was added after the Open API specs (see open_api directory), and should be added accordingly: https://www.openpolicyagent.org/docs/latest/rest-api/#config-api

[Olga Melnichenko]

Hello @anderseknert! I'd like to contribute to the project.
From my understanding, I should only be editing openapi.yaml to add config endpoint. Please confirm.

[Anders Eknert]

That’s great to hear! That’s correct, only that file needs updating.

[Olga Melnichenko]

Submitted PR. Please review

[Anders Eknert]

Oops, had forgotten to close this. Thanks for contributing, @Olgaminch7 👍