grim/hgkeeper

ebc5f568d629
Add a note about downloads and pgp verification to the readme
# Container
HGKeeper is available at
[docker.io/rwgrim/hgkeeper](https://hub.docker.com/r/rwgrim/hgkeeper) which is
updated via CI. Currently only a `latest` tag is provided.
HGKeeper should work under any container runtime, but has been tested with
Docker, containerd/runc, and podman. The documentation below uses the Docker
command line as it appears to be the most popular at the moment.
Like all modes of operation, running in a container is going to require an
`hgkeeper` administration repository and at least one SSH host key.