[CLNP-7524] chore: migrate CI configuration from CircleCI to GitHub Actions

[OnestarLee]

External Contributions

This project is not yet set up to accept pull requests from external contributors.

If you have a pull request that you believe should be accepted, please contact
the Developer Relations team [email protected] with details
and we'll evaluate if we can setup a CLA to allow for the contribution.

For Internal Contributors

[CLNP-7524](https://sendbird.atlassian.net/browse/CLNP-7524)

Description Of Changes

circleci -> github actions 으로 배포 스크립트 변경하였습니다.
ios 의 경우 Okta 우회하기 위해 api key 사용하는 방법으로 변경하였습니다.
ios 에서 node_bundle 과 Pods캐시를 리셋후 정상적으로 캐싱해도 XCode빌드가 실패하는 문제가 있습니다.
정확한 원인이 확인되지 않아 ios 빌드시 해당 폴더 캐시 사용하지 않도록 변경하였습니다.
추가로 Settings에서 미사용 secrets 값들 모두 삭제하였습니다

Types Of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply_

• Bugfix
• New feature
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance (ex) Prettier)
• Build configuration
• Improvement (refactor code)
• Test

[OnestarLee]

/bot create ticket --test

[github-actions]

[Creating Ticket] Preparing https://github.com/sendbird/sendbird-uikit-react-native/actions/runs/17449552169

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 11.09%. Comparing base (b8704a7) to head (892f7a8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   11.09%   11.09%           
=======================================
  Files         360      360           
  Lines        8818     8818           
  Branches     2497     2480   -17     
=======================================
  Hits          978      978           
  Misses       7764     7764           
  Partials       76       76           

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[Copilot]

Pull Request Overview

This PR migrates the CI/CD configuration from CircleCI to GitHub Actions for automated deployment of iOS and Android sample applications. The migration includes modernizing authentication methods and implementing optimized caching strategies.

• Replaced CircleCI workflow configuration with GitHub Actions workflows
• Updated iOS deployment to use App Store Connect API key authentication instead of username/password
• Implemented conditional caching strategy for node_modules while disabling problematic iOS Pods caching

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/workflows/publish-sample.yml	Complete GitHub Actions workflow replacing CircleCI with separate iOS and Android deployment jobs
sample/ios/fastlane/Fastfile	Updated iOS Fastfile to use App Store Connect API key authentication and improved CI detection
.github/workflows/comment-bot.yml	Updated bot configuration to use GitHub Actions instead of CircleCI
.github/README.md	Added comprehensive documentation for GitHub Actions setup and secret configuration
.circleci/config.yml	Removed CircleCI configuration file
.circleci/README.md	Removed CircleCI documentation

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[bang9]

lgtm~ 고생하셨습니다!