feat: add archive_name param to CompressStep (singleArchiveName field)

st_client.py

@@ -56,14 +56,15 @@ log = logging.getLogger("st_client")
 class CompressStep:
     """Compress matching files to ZIP. Non-matching files pass through."""
     def __init__(self, filter="*", level="NORMAL", single_archive=False,
-                 on_failure="PROCEED"):
+                 archive_name=None, on_failure="PROCEED"):
         self.filter = filter
         self.level = level
         self.single_archive = single_archive
+        self.archive_name = archive_name  # Required when single_archive=True
         self.on_failure = on_failure
 
     def to_api(self):
-        return {
+        payload = {
             "type": "Compress",
             "status": "ENABLED",
             "conditionType": "ALWAYS",
@@ -78,6 +79,9 @@ class CompressStep:
             "singleArchiveEnabled": self.single_archive,
             "zipPassword": "",
         }
+        if self.single_archive and self.archive_name:
+            payload["singleArchiveName"] = self.archive_name
+        return payload
 
 
 class PgpEncryptStep: