Feature add: config file as database

[rucciva]

Hi, first of all, thanks for making this awesome project.

What do you think of adding feature that enable sshportal to read all entity from config file instead of database. This will allow things that you can do with other infrastructure as code such as auditing and configuration versioning with git.

Thanks

[systemmonkey42]

Being able to build a docker container with a pre-configured YAML file including users/group/hosts/keys would be fantastic.

The use of a database, with a randomly generated initial invite makes automated deployment very difficult, and you need to source control a complex script instead of a readable configuration file.

Note - Its fine if it loads the config to the database, and ignore the config from that point on. Maybe have an environment variable to indicate whether or not the config file should overwrite an existing database on startup.

To be honest, a script which is executed on startup to generate the configuration would be almost as good, except it gets messy currently because of the need to paste keys (instead of specifying a filename on the command line) and the lack of commands to pre-load known authorized keys.