fix(k8s_loader): make docker base loader work
fix(k8s_loader): make docker base loader work

60735f3fc4f5d0b70ec7bd616341bb9826d4fa44 splited the loader
configuration into 2 files, but dropped the docker mount
which is still needed, until we refactor the code to use
the dynamic loaders approch.

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests