This is mainly for testing.
You can run with something like
```
docker run -v ~/.ssh/id_rsa.pub:/root/.ssh/authorized_keys -p 2222:22 -e TINI_SUBREAPER=1 --pid=host mobylinux/sshd:36c44542d8120e384c724a078e3e489f7a58382c
```
if you want to run in the host pid namespace. You must provide an
authorized key, you may provide a host key.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
Using docker build is slower and needs lots of Dockerfiles,
while a single image with a careful script can accept any type
of image, either with `-v` to share into `/tmp` for interactive
use (where you need the input and a tty, or by adding a tarball
for cases where there is no login such as running tests, so you
can still use a remote daemon in these cases.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>