Add admin user, and an option to add a user admin on startup

internal/config/config.go

@@ -33,6 +33,7 @@ type Config struct {
 	DemoMode            bool              `toml:"demo-mode" short:"D" default:"false" help:"Activate demo mode." comment:"Activate demo mode: anyone connecting to the instance will be logged in as a single user."`
 	DemoUsername        string            `toml:"demo-username" default:"demo" help:"Name of the single user used for the demo." comment:"Name of the single user used for the demo."`
 	AddUser             UserListAsStrings `toml:"add-user" short:"a" help:"Add users on startup following htpasswd bcrypt format." comment:"Add users on startup following htpasswd bcrypt format, example: [\"demo:$2y$10$UHR2646SZo2W.Rhna7bn5eWNLXWJZ/Sa3oLd9RlxlXs57Bwp6isOS\",\"user:$2y$10$3WYUp.VDpzJRywtrxO1s/uWfUIKpTE4yh5B1d2RCef3hvczYbEWTC\"]"`
+	AddAdminUser        UserListAsStrings `toml:"add-admin-user" short:"A" help:"Same as add-user but the added user has admin privilege." comment:"Same as add-user but the added user has admin privilege."`
 }
 
 type UserListAsStrings []string