chore: Add automated beta release workflow

[Copilot]

Usage

Trigger manually from Actions tab:

version: 2.0.0-beta.1
previous_version: 2.0.0-beta.0
dry_run: true

[louislam]

@copilot I decide to try to move some logic into extra/release/beta.mjs, I have refactored some code, added some TODO comments, can you finish them?

[Copilot]

@copilot I decide to try to move some logic into extra/release/beta.mjs, I have refactored some code, added some TODO comments, can you finish them?

Done! I've completed both TODO functions:

1. createDistTarGz() - Creates dist.tar.gz using Node.js tar package with proper error handling
2. createReleasePR() - Creates a draft PR with changelog using gh CLI, supports dry-run mode

Also fixed the environment variable mismatch (RELEASE_PREVIOUS_VERSION) and removed all TODO comments.

Commit: f03b27c

[Copilot]

Pull request overview

This PR implements a GitHub Actions workflow for automated beta releases with manual trigger support, automated changelog generation, Docker image builds, and distribution artifact upload.

Changes:

• Adds new GitHub Actions workflow for beta releases with manual trigger and dry-run support
• Refactors beta release script to remove interactive prompts and integrate PR creation
• Implements changelog generation and dist tarball creation functions

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.github/workflows/beta-release.yml	New workflow with manual trigger, version inputs, and multi-step release process
extra/release/beta.mjs	Removed interactive prompts, added dry-run support, integrated PR creation
extra/release/lib.mjs	Added createDistTarGz and createReleasePR functions with JSDoc
extra/generate-changelog.mjs	Exported generateChangelog function for programmatic use
package-lock.json	Automated dependency updates