Add CREDENTIALS_BASE_URL to MFE environment.
Add CREDENTIALS_BASE_URL to MFE environment.

edx/configuration,arbrandes/edx-configuration,mitodl/configuration,mitodl/configuration,mitodl/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,mitodl/configuration,arbrandes/edx-configuration,edx/configuration,edx/configuration,edx/configuration,arbrandes/edx-configuration