Fix gemlock file path

Author: kaiguo

Diff for: .circleci/config.yml

@@ -157,13 +157,17 @@ jobs:
           command: yarn --pure-lockfile --non-interactive --cache-folder ~/.cache/yarn
       - save-cache: *cache_save_yarn
       - restore_cache:
-          key: 1-gems-{{ checksum "Gemfile.lock" }}
-      - run: cd example/ios && bundle check || bundle install --path vendor/bundle
+          key: 1-gems-{{ checksum "example/ios/Gemfile.lock" }}
+      - run: 
+          name: Install CocoaPods
+          command: cd example/ios && bundle check || bundle install --path vendor/bundle
       - save_cache:
-          key: 1-gems-{{ checksum "Gemfile.lock" }}
+          key: 1-gems-{{ checksum "example/ios/Gemfile.lock" }}
           paths:
             - vendor/bundle
-      - run: cd example/ios && bundle exec pod install
+      - run:
+          name: Install pod dependencies
+          command: cd example/ios && bundle exec pod install
       - run:
           name: Build iOS app
           command: yarn build:e2e:ios