Suppress never-built branches from forks

Typically (always?), the only reason why a branch from a fork would be
built in the upstream is for a pull request. But as soon as we discover
a build from one such third-party branch, we look up all live branches
in that fork. As a result we would list all live branches in all forks,
with "(never built)".

Ignore these.

Author: wjt

godoctopus.py

@@ -220,6 +220,12 @@ def main() -> None:
 
     for org, fork in web_artifacts.items():
         for branch_name, branch in fork.live_branches.items():
+            if not branch.build and org != default_org:
+                logging.debug(
+                    "Ignoring never-built third-party branch %s:%s", org, branch_name
+                )
+                continue
+
             item: dict[str, Any] = {"name": f"{org}/{branch_name}"}
 
             try: