Add additional docs and integration tests for cache.s3.AuthenticationType
What does this MR do?
Adds missing docs and tests for the cache.s3.AuthenticationType setting.
Why was this MR needed?
What's the best way to test this MR?
The integration tests should cover previously uncovered functionality. Otherwise the feature should have been test with its original MR: !3117 (merged)
What are the relevant issue numbers?
Edited by Georgi N. Georgiev