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Automatically upgrading the instance with --backup-db=no is not
desirable for anyone who cares about their data. Now that we have an
"upgrade" command, people should run this directly. Accordingly, we drop
the "check" part of upgrade.

This option has been dropped in 3.27, so our "dev" image wasn't working for upgrading instances.
It appear the option is useless in 3.26 too, since it only start and stop the
instance if a pid file exists, which is never true in the docker image.

Cube name might not be equal to the package name stripped by 'cubicweb-'.
For instance cubicweb-saem-ref cube name is "saem_ref", not saem-ref.

Use a python script to detect the cube name using pkg_resources.

Keep mirroring on hub.extranet.logilab.fr/cubicweb/cubicweb

Seems using a default value is broken here, see https://github.com/moby/moby/issues/15025#issuecomment-371799311

By using a build argument CW_INSTANCE_NAME. The build argument cannot be set to
CW_INSTANCE because when running "ENV CW_INSTANCE=$CW_INSTANCE" docker lookup
the environment first before build arguments.