forgejo: add missing templating variable

Signed-off-by: David Kirwan <davidkirwanirl@gmail.com>

roles/openshift-apps/forgejo/templates/forgejo-dataprotectionapplication.yaml.j2

@@ -36,7 +36,7 @@ spec:
   - velero:
       config:
         profile: default
-        region: us-east-1
+        region: "{{ (env == 'production') | ternary(forgejo_backup_region, forgejo_stg_backup_region) }}"
       credential:
         key: cloud
         name: cloud-credentials