Don't set env variable to record responses when running in Docker
Don't set env variable to record responses when running in Docker

This causes the tests to fail when running in Docker when preparing
a deployment, so make sepia be a no-op in that case.

Change-Id: I757f3c82db44edff0c17857721e4d68a133b1fb4

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps