feat: add version_file_path option

Using the same logic as `actions/setup-node`, we can support `asdf`, `volta` or other version management techniques.

action.yml

@@ -7,6 +7,9 @@ inputs:
   version:
     description: Version of pnpm to install
     required: false
+  version_file_path:
+    description: "Path to a version file. Eg: '.tool-versions' for asdf or 'package.json' for volta"
+    required: false
   dest:
     description: Where to store pnpm files
     required: false