Add iOS build task

.travis.yml

@@ -80,3 +80,19 @@ matrix:
         - cd sdks/android/Mentat
         - ./gradlew --no-daemon clean :library:assemble :library:test :library:lint
         - cd ../../..
+    - language: rust
+      dist: trusty
+      rust: stable
+      os: osx
+      before_install:
+        - PKG_OS="darwin";
+      install:
+        - |
+        rustup target add aarch64-apple-ios armv7-apple-ios armv7s-apple-ios x86_64-apple-ios i386-apple-ios
+        cargo install cargo-lipo
+      script:
+        - ./scripts/ios_build.sh
+        - |
+          cd sdks/swift/Mentat
+          xcodebuild -configuration Debug -scheme "Mentat Debug" -sdk iphonesimulator test -destination 'platform=iOS Simulator,name=iPhone SE,OS=latest' | xcpretty
+          cd ../../..