fix app.json ENV vars (#10)

* convert integer to string.

* cache npm modules in CircleCI.

* fix app.json.

.circleci/config.yml

@@ -28,6 +28,9 @@ jobs:
             - gem-cache-{{ .Branch }}-{{ checksum "Gemfile.lock" }}
             - gem-cache-{{ .Branch }}
             - gem-cache
+            - npm-deps-{{ .Branch }}-{{ checksum "package.json" }}
+            - npm-deps-{{ checksum "package.json" }}
+            - npm-deps
 
       - run:
           name: install dependencies
@@ -39,15 +42,32 @@ jobs:
           key: gem-cache-{{ .Branch }}-{{ checksum "Gemfile.lock" }}
           paths:
             - vendor/bundle
+
       - save_cache:
           key: gem-cache-{{ .Branch }}
           paths:
             - vendor/bundle
+
       - save_cache:
           key: gem-cache
           paths:
             - vendor/bundle
 
+      - save_cache:
+          key: npm-deps-{{ .Branch }}-{{ checksum "Gemfile.lock" }}
+          paths:
+            - .node_modules
+
+      - save_cache:
+          key: npm-deps-{{ checksum "package.json" }}
+          paths:
+            - .node_modules
+
+      - save_cache:
+          key: npm-deps
+          paths:
+            - .node_modules
+
       # Database setup
       - run: bundle exec rails db:create
       - run: bundle exec rails db:schema:load

app.json

@@ -12,10 +12,10 @@
       "value": "3000"
     },
     "RAILS_MAX_THREADS": {
-      "value": 5
+      "value": "5"
     },
     "WEB_CONCURRENCY": {
-      "value": 2
+      "value": "2"
     }
   }
 }