grim/hgkeeper

dc46af0b583b
Spit out a warning if we find a duplicated key.

We're going to continue the existing behavior of overwriting the keys to not
break potential set ups for the time being.

Fixes HGKEEPER-22
# Running
There are multiple ways to run HGKeeper. It can be run in a
[container](container), as a [standalone](standalone) service directly on a
host, or executed [on demand](ondemand) by [OpenSSH](https://www.openssh.com/).
Both running in a [container](container) and running and
[standalone](standalone) can also be integrated with
[OpenSSH](https://www.openssh.com/) as well.