[build][ci] tweak iOS build workflow

.circleci/config.yml

@@ -159,14 +159,23 @@ jobs:
         name: Start iPhone 7 Plus simulator (background)
         background: true
         command: xcrun simctl boot "iPhone 7 Plus" || true
+    - run: *packager-jet
     - run:
         name: Configure Environment Variables
         command: |
           echo 'export PATH=/usr/local/opt/node@8/bin:$PATH' >> $BASH_ENV
           source $BASH_ENV
-    - run: *restore-brew-cache
+    # Brew
+    - restore-cache: *restore-brew-cache
     - run: *configure-jet-detox-environment
-    - run: *save-brew-cache
+    - save-cache: *save-brew-cache
+
+    # Yarn install - to ensure detox post install builds
+    - restore-cache: *restore-yarn-cache
+    - run: *yarn
+    - save-cache: *save-yarn-cache
+
+    # Pods
     - restore-cache: *restore-pods-cache
     - run:
         name: Install CocoaPods +  Pod Install
@@ -175,12 +184,16 @@ jobs:
           curl https://cocoapods-specs.circleci.com/fetch-cocoapods-repo-from-s3.sh | bash -s cf
           pod install
     - save-cache: *save-pods-cache
+
+
+    # XCode Build
     - restore-cache: *restore-ios-build-cache
     - run:
         name: Build iOS Testing App
         command: cd tests && yarn run build-ios
-    - run: *packager-jet
     - save-cache: *save-ios-build-cache
+
+    # Now Test \o/
     - run:
         name: Run Jet Tests
         command: cd tests && yarn run test-ios-cover