chore(ci): add manual prerelease workflow

[patrickkabwe]

Summary

• add a manual Pre-release workflow with selectable source branch and dry-run mode
• default prereleases to the next branch while allowing main as an explicit option
• add a prerelease-only semantic-release config so selected branches publish on the next channel
• add local dry-run scripts for main and next prerelease checks

Notes

• The workflow copies the prerelease config to RUNNER_TEMP before switching branches, so the selected branch does not need to already contain the new config file.
• The semantic-release command unsets GITHUB_ACTIONS so env-ci reads the checked-out branch instead of the workflow ref.

Verification

• bun lint
• bun run build
• go run github.com/rhysd/actionlint/cmd/actionlint@latest .github/workflows/pre-release.yml
• PRERELEASE_BRANCH=next node config check
• PRERELEASE_BRANCH=main node config check
• bun run prerelease:dry-run:main
• bun run prerelease:dry-run:next
• env-ci branch fallback probe

Summary by CodeRabbit

• New Features
  • Added a controlled pre-release workflow for publishing builds from the supported release branches.
  • Added dry-run options to preview pre-release publishing without releasing packages.
  • Added validation to ensure pre-releases use supported branch and channel settings.
  • Added safeguards to prevent overlapping pre-release runs and improve release reliability.

[coderabbitai]

Note

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 4c816e0d-3a1b-4263-a212-8d9bf075bf5f

📥 Commits

Reviewing files that changed from the base of the PR and between 3f55240 and d78b41c.

📒 Files selected for processing (3)

• .github/workflows/pre-release.yml
• package.json
• release.prerelease.config.cjs

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