fix(app-config): invalid app-config.yaml (#1075)

The app-config.yaml file was found to be invalid.
To address this issue and ensure consistency with backstage-showcase
(https://github.com/janus-idp/backstage-showcase/blob/main/app-config.yaml#L139),
the 'scaffolder' property has been set to an empty object.

Signed-off-by: Gloria Ciavarrini <[email protected]>

Author: gciavarrini

app-config.yaml

@@ -78,6 +78,7 @@ auth:
   providers: {}
 
 scaffolder:
+  {}
   # see https://backstage.io/docs/features/software-templates/configuration for software template options
 
 catalog: