add relay environment

lib/tasks/graphql.rake

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+namespace :graphql do
+  desc "Dump graphql schema to app/javascript/__generated__/schema.graphql"
+  task dump_schema: :environment do
+    File.write(
+      Rails.root.join("app/javascript/__generated__/schema.graphql"),
+      XStakeSchema.to_definition
+    )
+
+    puts("app/javascript/__generated__/schema.graphql updated")
+  end
+end