Mount sub path of repositories secret
Mount sub path of repositories secret

To prevent the emptyDir for the repositories cache from overwriting the
repositories.yaml since it's mounted on the same path.
Courtesy of https://blog.sebastian-daschner.com/entries/multiple-kubernetes-volumes-directory

Signed-off-by: Simon Rüegg <b727cebd510fa81322ca7d0467c72f389927c9c9@vshn.ch>

weaveworks/flux,weaveworks/flux