gitlab-based_packaging_workflow: Add missing redirect

Thank you @andrewsh for spotting it.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

content/guides/gitlab-based_packaging_workflow.md

@@ -5,6 +5,7 @@ weight = 100
 title = "GitLab-based Packaging Workflow"
 
 aliases = [
+    "/old-wiki/Guidelines/Git-based_packaging_workflow",
     "/old-wiki/Guidelines/Gitlab-based_packaging_workflow"
 ]
 +++