This repo demonstrates running Expo CLI in GitPod. Just open this repo in GitPod and it will start an Expo dev server that you can connect to using the Expo app running on a phone.
Click to open in GitPod: https://gitpod.io/#https://github.com/jayfresh/react-native-expo-gitpod
If you shut the Expo server down, you can run the app using npm start as this defaults expo start
to use the tunnel host parameter, which means the Expo mobile app can connect using a non-localhost URL
(since this is running in a remote VM).