Update CI configuration for XCode 12

Author: loremattei

.circleci/config.yml

@@ -3,42 +3,42 @@ version: 2.1
 orbs:
   # Using 1.0 of our Orbs means it will use the latest 1.0.x version from https://github.com/wordpress-mobile/circleci-orbs
   ios: wordpress-mobile/ios@1.0
+  git: wordpress-mobile/git@1.0
+
+xcode_version: &xcode_version
+  xcode-version: "12.1.0"
+
+iphone_test_device: &iphone_test_device
+  device: iPhone 11
+  ios-version: "14.1"
 
 workflows:
   test_and_validate:
     jobs:
-      - ios/test:
-          name: Carthage Update
-          xcode-version: "12.1.0"
-          workspace: Aztec.xcworkspace
-          scheme: CarthageBuild
-          device: iPhone 11
-
       - ios/test:
           name: Test
-          xcode-version: "12.1.0"
+          <<: *xcode_version
           bundle-install: false
           pod-install: false
           workspace: Aztec.xcworkspace
           scheme: AztecExample
-          device: iPhone 11
-          ios-version: "14.0"
+          <<: *iphone_test_device
 
       - ios/validate-podspec:
           name: Validate WordPress-Aztec-iOS.podspec
-          xcode-version: "12.1.0"
+          <<: *xcode_version
           podspec-path: WordPress-Aztec-iOS.podspec
 
       - ios/validate-podspec:
           name: Validate WordPress-Editor-iOS.podspec
-          xcode-version: "12.1.0"
+          <<: *xcode_version
           podspec-path: WordPress-Editor-iOS.podspec
           # Reference WordPress-Aztec-iOS.podspec locally so we don't have to get it from the specs repo
           additional-parameters: --include-podspecs=WordPress-Aztec-iOS.podspec
 
       - ios/publish-podspec:
           name: Publish WordPress-Aztec-iOS to Trunk
-          xcode-version: "12.1.0"
+          <<: *xcode_version
           podspec-path: WordPress-Aztec-iOS.podspec
           post-to-slack: true
           filters:
@@ -50,7 +50,7 @@ workflows:
       - ios/publish-podspec:
           name: Publish WordPress-Editor-iOS to Trunk
           requires: [ "Publish WordPress-Aztec-iOS to Trunk" ]
-          xcode-version: "12.1.0"
+          <<: *xcode_version
           podspec-path: WordPress-Editor-iOS.podspec
           post-to-slack: true
           filters: