Add setup script

The container setup script copies the Roundcube configuration files in
place, from the /etc/roundcube directory, and runs database migrations
if necessary.
3 jobs for master in 3 minutes and 30 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #2743
build

00:01:19

 
  Docker Build
passed #2744
docker_build

00:01:48

 
  Release
passed #2745
release

00:00:22