Move URLs from default section of config to DB

This change moves the callback_url, metadata_url and webhooks_url from
the config to the database. The goal is to move as much as possible from
the config to the DB, in preparation for a potential refactor that will
allow GARM to scale out. This would allow multiple nodes to share a single
source of truth.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

database/sql/models.go

@@ -207,6 +207,10 @@ type ControllerInfo struct {
 	Base
 
 	ControllerID uuid.UUID
+
+	CallbackURL    string
+	MetadataURL    string
+	WebhookBaseURL string
 }
 
 type WorkflowJob struct {