There’s a download link on the page I linked, I don’t think they have a container version available, it’ll have to be installed manually.
I run mine on a LXC dedicated for that application and time it to boot before the rest of the docker servers.
If you deploy it as a container you could end up with a chicken and egg situation.
I use a combination of netbox for the physical/logical network and server connectivity, and outline for text documentation of the different components.