Make schema configurable, export config and default schema

Author: joselfonseca

config/config.php

@@ -21,4 +21,14 @@
     |
     */
     'client_secret' => env('PASSPORT_CLIENT_SECRET', null),
+    /*
+    |--------------------------------------------------------------------------
+    | GraphQL schema
+    |--------------------------------------------------------------------------
+    |
+    | File path of the GraphQL schema to be used, defaults to null so it uses
+    | the default location
+    |
+    */
+    'schema' => null
 ];

src/Providers/LighthouseGraphQLPassportServiceProvider.php

@@ -21,6 +21,9 @@ public function register()
         app('events')->listen(
             BuildingAST::class,
             function (BuildingAST $buildingAST): string {
+                if(config('lighthouse-graphql-passport.schema')) {
+                    return file_get_contents(config('lighthouse-graphql-passport.schema'));
+                }
                 return file_get_contents(__DIR__."/../../graphql/auth.graphql");
             }
         );
@@ -36,6 +39,7 @@ protected function registerConfig()
         $this->publishes(
             [
                 __DIR__.'/../../config/config.php' => config_path('lighthouse-graphql-passport.php'),
+                __DIR__.'/../../graphql/auth.graphql' => base_path('graphql/auth.graphql'),
             ]
         );
         $this->mergeConfigFrom(