fix: typo in tag reference pattern matching (#603)

## 📝 Description
tag reference would be `refs/tags/<tag_name>` so in this case we are
picking up the trailing `/` before tag name

## ✅ Checklist
- [x] I have tested this change
- [ ] This change requires documentation update

Author: hamir-suspect

notifications/lib/notifications/workers/coordinator.ex

@@ -105,7 +105,7 @@ defmodule Notifications.Workers.Coordinator do
     defp extract_references(_pipeline, hook = %{git_ref_type: :TAG}), do: {hook.tag_name, nil, ""}
     defp extract_references(pipeline, hook), do: {nil, pipeline.branch_name, hook.pr_branch_name}
 
-    defp extract_references_from_pipeline(%{branch_name: "refs/tags" <> tag_name}),
+    defp extract_references_from_pipeline(%{branch_name: "refs/tags/" <> tag_name}),
       do: {tag_name, nil, ""}
 
     defp extract_references_from_pipeline(%{branch_name: branch_name}), do: {nil, branch_name, ""}