Adding custom entries to haproxy is problematic

[hyperbolic2346]

Currently the haproxy confd template is generated with run.sh in the haproxy container. This means that the only way to change the template is to eclipse the script with your own to generate a different config file. This works fine, but has the unfortunate side-effect of the template only updating when the container is restarted.

This is just a quality of life type of thing.