Make demo work with alpine
Make demo work with alpine

If you specify (in the docker-compose.override.yml) that you want to use
the alpine image for the demo, the entrypoint has to work with sh, not
use bash-specific testing.  This makes that possible.

uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server