add ,

Author: NickLarsenNZ

.github/workflows/ubi-rust-builder.yml

@@ -98,7 +98,7 @@ jobs:
           channel-id: "C07UG7RS44X"
           payload: |
             {
-              "text": "Workflow failed"
+              "text": "Workflow failed",
               "attachments": [
                 {
                   "pretext": "Holy moly",