openrc docker init does not use system proxy

dockerd started by /etc/init.d/docker does not honor the proxy configured by setup-proxy.

1. repro:

2. setup-proxy http://192.0.2.1:8080

3. rc-service docker restart

1. docker pull alpine:latest
   Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp 34.200.90.16:443: connect: network is unreachable

2. fix:
   load proxy environment variables in /etc/init.d/docker
   —- /etc/init.d/docker.orig
   + /etc/init.d/docker
   @@ –32,5 +32,9 @@
   # in the kernel. We recommend using cgroups to do container-local accounting.
   ulimit -p unlimited

+ if -e /etc/profile.d/proxy.sh; then

• source /etc/profile.d/proxy.sh
• fi

return 0
}

(from redmine: issue id 8726, created on 2018-03-25)