Fix foreign key on build template with postgresql

.dredd/hooks/capabilities.go

@@ -234,6 +234,7 @@ func alterRequestBody(t *trans.Transaction) {
 	bodyFieldProcessor("inventory_id", inventoryID, &request)
 	bodyFieldProcessor("repository_id", repoID, &request)
 	bodyFieldProcessor("template_id", templateID, &request)
+	bodyFieldProcessor("build_template_id", nil, &request)
 	if task != nil {
 		bodyFieldProcessor("task_id", task.ID, &request)
 	}

api-docs.yml

@@ -890,10 +890,6 @@ definitions:
     properties:
       id:
         type: integer
-      template_id:
-        type: integer
-      project_id:
-        type: integer
       name:
         type: string
         example: default
@@ -909,6 +905,7 @@ definitions:
         type:
           - string
           - 'null'
+        example: path/to/script-client.py
 
   ScheduleRequest:
     type: object