Publish gem to GitHub Packages

[aladac]

Summary

• Adds GitHub Packages publishing so the gem appears on the profile Packages tab
• Triggers on v* tag push (same as existing release flow)
• Uses GITHUB_TOKEN — no additional secrets needed

Test plan

• Merge this PR
• Push a new version tag: git tag v<next> && git push --tags
• Verify gem appears at https://github.com/aladac?tab=packages

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Note

Medium Risk
Adds an additional package publish target and grants packages: write to the workflow; failures or misconfiguration could break releases or publish to an unexpected namespace.

Overview
Extends the tag-based release workflow to also publish the built .gem to GitHub Packages via rubygems.pkg.github.com using the repository GITHUB_TOKEN.

Updates workflow permissions to include packages: write and writes a temporary ~/.gem/credentials entry for the GitHub push step.

^{Written by Cursor Bugbot for commit 979c27c. This will update automatically on new commits. Configure here.}

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