Create base docker image
This solves the problem of having a /gems/
directory available for
each service own image. It is important to notice that a Dockerfile
cannot reference a parent directory. Thus ADD ../gems/ /gems/
is
invalid.
Also we take this opportunity to unify the base image, making easier to change it and update it, and the installed packages.
This addresses the following CI error: https://gitlab.com/interscity/interscity-platform/interscity-platform/-/jobs/275584651
Part of #28 (closed)