cmd/app: configure username and hostname

These no longer need to be hardcoded since this is not subject to the limitations of home-manager.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/app/app.go

@@ -172,6 +172,14 @@ func parse(id string, base *check.Absolute, r io.Reader) (*hst.Config, error) {
 		}
 
 		switch key {
+		case "username":
+			c.Container.Username = value
+			continue
+
+		case "hostname":
+			c.Container.Hostname = value
+			continue
+
 		case "group":
 			c.Groups = append(c.Groups, value)
 			continue