Exclude the .git directory by default

merge/action.yml

@@ -36,6 +36,9 @@ inputs:
       If true, the artifacts that were merged will be deleted.
       If false, the artifacts will still exist.
     default: 'false'
+  include-git-directory:
+    description: 'Include files in the .git directory in the merged artifact.'
+    default: 'false'
 
 outputs:
   artifact-id: