Merge branch '114-build-example-app-in-ci' into 'dev'

Add Gitlab file that tells CI how to build the example app. Closes objectbox-swift#114 See merge request objectbox/objectbox-swift-public!3

Author: vaind

.gitlab-ci.yml

@@ -0,0 +1,16 @@
+stages:
+ - build
+ - archive
+
+build_project:
+ stage: build
+ tags: [mac, x64, xcode]
+ script:
+ - cd Example
+ - pod repo update
+ - pod install
+ - Pods/ObjectBox/setup.rb
+ - xcodebuild build -workspace NotesExample.xcworkspace -scheme NotesExample-macOS -destination 'platform=OS X,arch=x86_64' -verbose
+
+variables:
+ GIT_SUBMODULE_STRATEGY: recursive