Test RNTesterPods on CI with use_frameworks! enabled (#25818)

Summary:
This adds a `test_ios_frameworks` job to CircleCI to test the `RNTesterPods` project with `use_frameworks!` enabled. It will ensure the issue in https://github.com/facebook/react-native/issues/25349 is not reintroduced as suggested in https://github.com/facebook/react-native/pull/25619#issuecomment-514380653.

## Changelog

[iOS] [Internal] - Added CircleCI job for testing `RNTesterPods` with `use_frameworks!` enabled.
Pull Request resolved: https://github.com/facebook/react-native/pull/25818

Test Plan: Tests seem to be failing on `master` at the moment but you can see that the new job builds successfully [here](https://circleci.com/gh/facebook/react-native/103929?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link). You can confirm it installs the pods with `use_frameworks!` by seeing that `Installing pods with use_frameworks!` is at the start of the log for the `Generate RNTesterPods Workspace` step.

Reviewed By: hramos

Differential Revision: D16495016

Pulled By: fkgozali

fbshipit-source-id: 8ef607cc3a152f599d226f9f45d990fba50a65d4

.circleci/config.yml

@@ -122,15 +122,19 @@ commands:
       steps:
         type: steps
     steps:
+      - run:
+          name: Setup CocoaPods cache
+          # Copy RNTester/Podfile.lock since it can be changed by pod install
+          command: cp RNTester/Podfile.lock RNTester/Podfile.lock.bak
       - restore_cache:
           keys:
-            - v1-pods-{{ checksum "RNTester/Podfile.lock" }}
-            - v1-pods-
+            - v1-pods-{{ .Environment.CIRCLE_JOB }}-{{ checksum "RNTester/Podfile.lock.bak" }}
+            - v1-pods-{{ .Environment.CIRCLE_JOB }}-
       - steps: << parameters.steps >>
       - save_cache:
           paths:
             - RNTester/Pods
-          key: v1-pods-{{ checksum "RNTester/Podfile.lock" }}
+          key: v1-pods-{{ .Environment.CIRCLE_JOB }}-{{ checksum "RNTester/Podfile.lock.bak" }}
 
   download_gradle_dependencies:
     steps:
@@ -301,6 +305,10 @@ jobs:
   # Runs unit tests on iOS devices
   test_ios:
     executor: reactnativeios
+    parameters:
+      use_frameworks:
+        type: boolean
+        default: false
     environment:
       - REPORTS_DIR: "./reports"
     steps:
@@ -321,6 +329,13 @@ jobs:
           command: |
             curl https://cocoapods-specs.circleci.com/fetch-cocoapods-repo-from-s3.sh | bash -s cf
 
+      - when:
+          condition: << parameters.use_frameworks >>
+          steps:
+            - run:
+                name: Set USE_FRAMEWORKS=1
+                command: echo "export USE_FRAMEWORKS=1" >> $BASH_ENV
+
       - with_pods_cache_span:
           steps:
             - run:
@@ -609,6 +624,11 @@ workflows:
       - test_ios:
           requires:
             - setup_ios
+      - test_ios:
+          name: test_ios_frameworks
+          use_frameworks: true
+          requires:
+            - setup_ios
       - test_ios_e2e:
           requires:
             - setup_ios

RNTester/Podfile

@@ -2,10 +2,12 @@ platform :ios, '9.0'
 
 require_relative '../scripts/autolink-ios'
 
-def pods()
-  # Uncomment for Swift
-  # use_frameworks!
+if ENV['USE_FRAMEWORKS'] == '1'
+  puts "Installing pods with use_frameworks!"
+  use_frameworks!
+end
 
+def pods()
   project 'RNTesterPods.xcodeproj'
 
   # Enable TurboModule

RNTester/Podfile.lock

@@ -375,6 +375,6 @@ SPEC CHECKSUMS:
   ReactCommon: 63d1a6355d5810a21a61efda9ac93804571a1b8b
   yoga: b72aa5b3708cc93c5897f8297122d6eba1331e07
 
-PODFILE CHECKSUM: f866eab42001b1d59349bce6b20d00912cdc700c
+PODFILE CHECKSUM: 060903e270072f1e192b064848e6c34528af1c87
 
 COCOAPODS: 1.7.1