Add new input to action definition

action.yml

@@ -11,6 +11,9 @@ inputs:
   restore-keys:
     description: 'An ordered list of keys to use for restoring the cache if no cache hit occurred for key'
     required: false
+  only-check-key:
+    description: 'Just check that the primary key exists, without downloading the cache'
+    require: false
 outputs:
   cache-hit:
     description: 'A boolean value to indicate an exact match was found for the primary key'