feat: add package_json_file option

Signed-off-by: Kengo TODA <skypencil@gmail.com>

action.yml

@@ -6,6 +6,7 @@ branding:
 inputs:
   version:
     description: Version of pnpm to install
+    required: false
   dest:
     description: Where to store pnpm files
     required: false
@@ -14,6 +15,10 @@ inputs:
     description: If specified, run `pnpm install`
     required: false
     default: 'null'
+  package_json_file:
+    description: File path to the package.json to read "packageManager" configutation
+    required: false
+    default: 'package.json'
 runs:
   using: node16
   main: dist/index.js