ZENKO-2514 ensure we're not writing data in the container overlay
ZENKO-2514 ensure we're not writing data in the container overlay

The CI when it starts running ShellCommands it will write some data like
the git repository. We need to ensure they all been written in the proper
path/volume so that we can benefit some good performances.

https://docs.docker.com/storage/volumes/

scality/backbeat,scality/backbeat,scality/backbeat,scality/backbeat