feat(ci): add no_upload_srpms label (#5758) (#5785)

* feat(ci): add no_upload_srpms label

This also fixes manual builds to support subrepos properly.

* to make sure it actually works

* manually set permissions

(cherry picked from commit bc5a6c144c)

Signed-off-by: GildedRoach <GildedRoach@users.noreply.github.com>
Co-authored-by: madomado <madonuko@outlook.com>

.github/workflows/sync.yml

@@ -1,5 +1,7 @@
 name: Automatic backport/sync action
-
+permissions:
+  contents: write
+  pull-requests: write
 on:
   pull_request_target:
     types: ["labeled", "closed"]