Auto backport - promoted-to-master label not having effect

Currently adding a label backport-x.x is enough to open a backport PR.

The issue is that the github action is only checking for backport labels while the script if we have args.pull_request will ignore completely this label again.

With this fix I'm setting the check for labels including the promoted_label outside of the else statement. This way the script will always check it.

Refs: scylladb#4979

Author: lsfreitas

.github/scripts/auto-backport.py

@@ -151,12 +151,12 @@ def main():
         else:
             labels = [label.name for label in pr.labels]
             backport_labels = [label for label in labels if backport_label_pattern.match(label)]
-            if promoted_label not in labels:
-                print(f'no {promoted_label} label: {pr.number}')
-                continue
-            if not backport_labels:
-                print(f'no backport label: {pr.number}')
-                continue
+        if promoted_label not in labels:
+            print(f'no {promoted_label} label: {pr.number}')
+            continue
+        if not backport_labels:
+            print(f'no backport label: {pr.number}')
+            continue
         commits = get_pr_commits(repo, pr, stable_branch, start_commit)
         logging.info(f"Found PR #{pr.number} with commit {commits} and the following labels: {backport_labels}")
         for backport_label in backport_labels: