Update the app.json

Author: toolmantim

app.json

@@ -1,19 +1,12 @@
 {
-  "addons": [
-
-  ],
+  "name": "docs-review",
+  "description": "The base app for Buildkite docs pull request review apps",
+  "stack": "heroku-18",
   "buildpacks": [
-    {
-      "url": "heroku/ruby"
-    }
+    { "url": "https://github.com/dmathieu/heroku-buildpack-submodules" },
+    { "url": "heroku/ruby" }
   ],
-  "description": "The base app for Buildkite docs pull request review apps",
   "env": {
-  },
-  "formation": {
-  },
-  "name": "docs-review",
-  "scripts": {
-  },
-  "stack": "heroku-18"
+    "ROBOTS_NO_INDEX": "true"
+  }
 }