I just connected in ssh to the container after a build, and docker ps returns:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f9ff1843ec8b eu.gcr.io/[PROJECT_NAME]/[MAIN_CONTAINER_NAME]:latest "/bin/sh -c 'bundle e" 2 minutes ago Up 2 minutes 0.0.0.0:3000->3000/tcp tiny_wescoff
exactly what I expected, which leave me even more confused.
I couldn’t curl in ssh either, as expected.