Github CD Enhancements

[StanevPrime]

As a developer I want be able to run build and deploy pipelines separately.

ACs:

• [x] Update github workflow names so they reflect actual functionality (build_and_deploy instead of just build_app and similar)
• [x] Split the existing github workflows (build_*_app) into two separate ones:
  • [x] The build pipeline should produce artefacts, which will be used as an input in the deploy pipeline
  • [x] build_ios
  • [x] build_anroid
  • [x] The deploy pipeline should be created for iOS and Android, which should run right after the build pipeline
  • [x] deploy_to_test_flight
  • [x] deploy_to_google_play
• [x] Research and implement caching for steps that could be optimised
  • A good starting point might be this Github action: https://github.com/actions/cache