[keyserver] Configure container user with same UID/GID as host
Summary:
See the inline code comment as well as the ENG-1230.
Depends on D4210
Test Plan:
- I ran this Docker Compose config on a Linux host and made sure that /etc/passwd had the UID for the comm user matching the UID of the host user
- I chmod the backups folder back to 755 so the user would have to be set correctly, and made sure backups were being generated
Reviewers: palys-swm, atul
Reviewed By: palys-swm
Subscribers: Adrian, yayabosh
Differential Revision: https://phabricator.ashoat.com/D4211