Setting up Bookstack

Turned out to be pretty simple. 
 deployment.secrets.bookstack-app-key = {
	source = "../private/bookstack/app-key";
	destination = "/var/lib/bookstack/app-key";
	owner = { user = "bookstack"; group = "bookstack"; };
	permissions = "0700";
};

services.bookstack = {
	enable = true;
	hostname = "wiki.slightly.tech";
	maxUploadSize = "10G";
	appKeyFile = "/var/lib/bookstack/app-key";
	nginx = { enableACME = true; forceSSL = true; };
	database = { createLocally = true; };
}; 
 Server was running an old version of NixOS, 23.05, where MySQL doesn't work in a VPS (anymore). Upgraded the whole thing to 24.11 and then it Just Worked. 
 Afterwards, run: 
 bookstack bookstack:create-admin 
 ... in a terminal on the server to set up the primary administrator account. Done.