ci: run the iOS apps in ci (#202)
ci: run the iOS apps in ci (#202)

Signed-off-by: a8d7fdba914ec41ef6e5a65854a2b125ca0691d3@lyft.com

Description: previously the CI runs would only build the demos. However we did not run them, or check for liveliness. This is a first iteration of doing so for iOS.
Risk Level: low - improved CI
Testing: tested locally and on CI

Part of #117
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile