chore(label-actions): no-merge-from-main (#33875)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

.github/label-actions.yml

@@ -263,6 +263,21 @@
     Good luck,
 
 
+    The Renovate team
+
+'auto:no-merge-from-main':
+  comment: >
+    Hi there,
+
+
+    Please don't merge from `main` into your PR's branch unless you have a merge conflict or have a specific reason to do so.
+    Doing so consumes CI systems unnecessarily, and also resets CI approvals if this is your first PR to the repo.
+    This repo uses GitHub's Merge Queue, which will automatically test your PR against `main` before merging, so it's no longer necessary to always keep branches up-to-date.
+
+
+    Thanks,
+
+
     The Renovate team
 
 'auto:discussion-first':