feat(ci): implement signed commit via GitHub API in release process

[philprime]

No description provided.

[Copilot]

Pull request overview

This PR implements signed, verified commits for the CI release process by using the GitHub API instead of local git commands. This ensures commits are signed by GitHub and linked to the GitHub App, improving security and traceability.

Changes:

• Replaced local git commit/push workflow with GitHub API-based commit creation using Octokit
• Added new _commit_and_tag_version_signed private lane that creates commits via GitHub API
• Removed git configuration step from CI workflow since commits are now created via API
• Added octokit gem and its dependencies to handle GitHub API interactions

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
fastlane/lanes/release.rb	Updated release_beta_ci lane to use new signed commit function and updated documentation
fastlane/lanes/git.rb	Added _commit_and_tag_version_signed function with GitHub API integration and extracted VERSION_BUMP_FILES constant
Gemfile	Added octokit gem dependency
Gemfile.lock	Added octokit and sawyer dependencies with version constraints
.github/workflows/release-beta.yml	Removed git configuration step and added RELEASE_BOT_TOKEN environment variable

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