feat: add release packaging & automated GitHub releases

[hendriknielaender]

Hey @kristoff-it, this PR adds cross-platform binary packaging and an automated release workflow to streamline the release process for Ziggy. I was looking at #48 and figured out that there was no real release mechanism. I don't know if there is anything on the roadmap for that, tried to keep it as minimal as possible.

Changes

• Build system improvements:

  • Added tar.gz packaging for Unix-like platforms (macOS, Linux)
  • Added zip packaging for Windows platforms
  • All packages are organized in zig-out/archives/

• CI/CD improvements:

  • Added GitHub Actions workflow for automated releases
  • Releases are triggered when a tag starting with "v" is pushed
  • All binary packages are automatically attached to GitHub releases
  • Release notes are automatically generated from commit history

How to use

To create a new release:

1. Ensure all changes are committed and pushed to main
2. Create and push a tag: git tag v1.0.0 && git push origin v1.0.0
3. The workflow will automatically build all packages and create a GitHub release

Motivation

This addresses the issue with Zed extension SDK not supporting xz decompression by providing gzip and zip alternatives. #48