WIP: Ubuntu CI build and .deb packaging workflow - Stable Build

[HATAKEkakshi]

This PR adds a GitHub Actions CI workflow (github-actions-stable-ubuntu-build.yaml) that automatically builds OpenROAD from source on Ubuntu and packages it as a ready-to-install .deb file.

Workflow Steps

1. Checkout — Clones the repo with all submodules
2. System Update — Updates packages and installs patchelf
3. Install Dependencies — Runs DependencyInstaller.sh for base and common dependencies
4. Build — Compiles OpenROAD using Build.sh
5. Verify — Confirms the binary was built successfully
6. Package — Creates a Debian package (openroad_amd64.deb) with:
   • Binary at /usr/bin/openroad
   • Runtime libraries bundled under /usr/lib/openroad/
   • RPATH patched via patchelf so the binary finds its bundled libs
   • Binary stripped to reduce size
7. Upload Artifact — Attaches the .deb as a downloadable build artifact
8. Create Pre-Release — Publishes a GitHub pre-release with the .deb file

Trigger

• Push to master branch

Prerequisites

Important

This workflow uses ${{ secrets.GITHUB_TOKEN }} to create GitHub releases. The token is automatically provided by GitHub Actions, but ensure your repository has Settings → Actions → General → Workflow permissions set to "Read and write permissions".

How to Install

sudo apt install ./openroad_amd64.deb
openroad -version
openroad -gui