[build][ci] add brew caching

.circleci/config.yml

@@ -34,6 +34,14 @@ aliases:
     keys:
     - ios-build-cache-{{ arch }}-{{ checksum "ios/RNFirebase.podspec" }}-{{ checksum "tests/ios/Podfile" }}-{{ checksum "tests/ios/Podfile.lock" }}
 
+  - &save-brew-cache
+    paths:
+    - /usr/local/Homebrew
+    key: brew-cache-{{ arch }}
+
+  - &restore-brew-cache
+    keys:
+    - brew-cache-{{ arch }}
 
   - &configure-jet-detox-environment
     name: Configure Jet + Detox Environment
@@ -155,8 +163,9 @@ jobs:
         command: |
           echo 'export PATH=/usr/local/opt/node@8/bin:$PATH' >> $BASH_ENV
           source $BASH_ENV
+    - run: *restore-brew-cache
     - run: *configure-jet-detox-environment
-    - run: *packager-jet
+    - run: *save-brew-cache
     - restore-cache: *restore-pods-cache
     - run:
         name: Install CocoaPods +  Pod Install
@@ -169,6 +178,7 @@ jobs:
     - run:
         name: Build iOS Testing App
         command: cd tests && yarn run build-ios
+    - run: *packager-jet
     - save-cache: *save-ios-build-cache
     - run:
         name: Run Jet Tests