added sample output

.forgejo/actions/artifact-upload/action.yml

@@ -9,7 +9,10 @@ inputs:
   path:
     default: /bin
     description: Paths of the file or directory with the data
-outputs: {}
+outputs:
+  T:
+    description: just a sample output
+    value: TEST
 runs:
   using: composite
   steps: