Setup Github Actions

[retyui]

Summary

Setup Github Actions

• eslint
• flow
• cache
• Android build (multiple versions next->0.73.0-rc.3, latest->0.72.6, 0.71-stable->0.71.14)
• iOS buid (multiple versions: next->0.73.0-rc.3, latest->0.72.6, 0.71-stable->0.71.14)

Test plan

Tested on my fork: https://github.com/retyui/react-native-image-editor/actions/runs/6718981645

[thymikee]

Awesome! I think it would be enough to test the build on the latest RN version. Although 3 seem nice, it sounds like overkill for this library (making the test runs last 30+ min instead of 10-ish)

[retyui]

Good point!