disable DRY_RUN on releasable branches (#589) (#628)

Author: pzl

.buildkite/sign_and_publish.yml.py

@@ -6,6 +6,7 @@
 import argparse
 import json
 import os
+import re
 
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser()
@@ -19,7 +20,7 @@ def main():
     # This only gets triggered when the branch is either main or 7.\d or 8.\d
     # So, dry_run is true for non main branch
     branch = os.getenv("BUILDKITE_BRANCH")
-    dry_run = branch != "main"
+    dry_run = not (branch == "main" or branch == "8.x" or re.match(r"^[78]\.\d+$", branch))
     pipeline = {}
     steps = [
         {