Add support for reference repository parameter

action.yml

@@ -65,6 +65,12 @@ inputs:
   fetch-depth:
     description: 'Number of commits to fetch. 0 indicates all history for all branches and tags.'
     default: 1
+  reference:
+    required: false
+    description: >
+      Path to a local bare git [reference repository to minimize network usage](https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---reference-if-ableltrepositorygt).
+      
+      If the directory doesn't exists this option will ignore it and log a message.
   lfs:
     description: 'Whether to download Git-LFS files'
     default: false