- Replaced OpenIndiana VM with OmniOS VM in Illumos build steps across `rust.yml` and `release.yml` workflows.
- Updated related workflow labels and comments for consistency.
- Deleted the Jenkinsfile, transitioning all CI workflows to GitHub Actions.
- Added Illumos (OpenIndiana) build and release steps to GitHub workflows.
- Created a new release pipeline triggered by version tags starting with `v`.
- Updated README with release instructions using `cargo-release`.