[hack] Show upstream push command after tag creation

Detects the remote pointing to openshift/windows-machine-config-operator
and uses its name in the post-creation push instruction, falling back to
the upstream SSH URL if no matching remote is configured.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mtnbikenc

hack/create-release-tag.py

@@ -152,6 +152,23 @@ def resolve_commit(ref: str) -> str:
 # Main
 # ---------------------------------------------------------------------------
 
+def _find_upstream_remote() -> str:
+    """
+    Return the name of the remote pointing to openshift/windows-machine-config-operator,
+    or '' if none is configured.
+    """
+    try:
+        lines = git("remote", "-v").splitlines()
+    except RuntimeError:
+        return ""
+    for line in lines:
+        # Each line: "<name>\t<url> (fetch|push)"
+        parts = line.split()
+        if len(parts) >= 2 and "openshift/windows-machine-config-operator" in parts[1]:
+            return parts[0]
+    return ""
+
+
 def main():
     parser = argparse.ArgumentParser(
         description="Create an annotated WMCO release tag.",
@@ -256,9 +273,12 @@ def main():
         print(f"\nERROR: Failed to create tag: {exc}", file=sys.stderr)
         sys.exit(1)
 
+    upstream_remote = _find_upstream_remote()
+    push_target = upstream_remote if upstream_remote else "git@github.com:openshift/windows-machine-config-operator.git"
+
     print()
-    print(f"Tag '{tag}' created. To push:")
-    print(f"  git push origin {tag}")
+    print(f"Tag '{tag}' created. To push to the upstream repository:")
+    print(f"  git push {push_target} {tag}")
 
 
 if __name__ == "__main__":