We were using Debian but Alpine more consistent. Use nested build.
Currently extract the hash in a nasty way but this can be fixed later
when we switch over hashing method.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
For the time being I've decided to exploit shared mounts to make
`/opt/cni` and `/etc/cni` work as expected. We need these directories
to appear writable on the host, and allow Weave Net pod to bind-mount
out them in order to install plugin binaries, and allow for vanilla
CNI plugins to be also accessible to kubelet.
Signed-off-by: Ilya Dmitrichenko <errordeveloper@gmail.com>
Previously only `/var` was `rshared` but some people need to share
mounts in `/opt` etc so let us make everything `rshared` for now.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
