adding outputs

save/action.yml

@@ -11,6 +11,9 @@ inputs:
   upload-chunk-size:
     description: 'The chunk size used to split up large files during upload, in bytes'
     required: false
+  matched-key:
+    description: 'Cache key restored from the restore action'
+    required: false
 runs:
   using: 'node16'
   main: '../dist/save/index.js'