Before building the docker

Since it's not on docker hub because blablabla, you have to :

Edit your config.toml to match your infrastructure
generate a keypair dedicated to this docker : ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
- it's highly recommanded to use a restrained authorized_keys files with this key to be sure that it will be only usable from a single IP (after all it's a root executed software) : from="1.2.3.4,1.2.3.5" ssh-rsa [...] your_email@example.com
Deploy your ssh key on the targetted machines