feat: generate auth bundle

[andrewworld]

Summary

Generated and pushed auth container bundle files to work with https://github.com/callstack-internal/news-mini-app-template.

Test plan

Please test in https://github.com/callstack-internal/news-mini-app-template after making the repo public

[andrewworld]

I'm really not sure if we want to add the generated code in this example. It clutters the example plus adds extra maintenance burden, as we'd need to generate a new one with every host app change. Can we convert this to an instruction? "you can expose host to be available as a remote to be consumed by other mini-apps if necessary. here's how to doit"

Yep, I will add this into README.md files and maybe Troubleshooting chapter as well

[thymikee]

Please do! :)