add cors to ingester
add cors to ingester

Summary: add cors to ingester

Test Plan:
deploy this with the blueprint change, then
integration test, and trying to force an ingest from blueprint integration

Reviewers: maasted

Reviewed By: maasted

Subscribers: gareth, dgarg

Differential Revision: https://phabricator.internal.justin.tv/D2674

TwitchScience/rs_ingester,TwitchScience/rs_ingester