[ubuntu-image] Add Ubuntu Actions Runner Image Analysis Documentation

[github-actions]

Ubuntu Actions Runner Image Analysis

This PR adds comprehensive documentation analyzing the default Ubuntu Actions runner image (ubuntu-latest).

Changes

• Created research/ubuntulatest.md with detailed analysis of Ubuntu 24.04 LTS runner image
• Source: GitHub Actions Runner Images Repository (main branch)
• Analysis date: 2026-02-07

Documentation Contents

The analysis includes:

1. Operating System Details

• Ubuntu 24.04 LTS (Noble Numbat)
• Kernel 6.x (Azure-optimized)
• x86_64 architecture

2. Language Runtimes

• Node.js: Multiple versions (16.x, 18.x, 20.x, 22.x) with npm, yarn, pnpm
• Python: 3.10.x, 3.11.x, 3.12.x with pip, pipenv, poetry
• Ruby: 3.0.x through 3.3.x with gem and bundler
• Go: 1.21.x through 1.23.x
• Java/JDK: Temurin 11, 17, 21 (LTS versions)
• PHP: 8.1.x through 8.3.x with Composer
• Rust: Latest stable with cargo
• .NET: SDK 6.0, 7.0, 8.0

3. Container & Orchestration Tools

• Docker: 24.x/25.x with compose, buildx, containerd
• Kubernetes: kubectl, helm, minikube, kind
• Container registry support for Docker Hub, ACR, ECR, GCR

4. Build Tools

• Compilers: gcc/g++ 13.x, clang 18.x
• Build systems: Make, CMake, Ninja, Meson
• Additional: pkg-config, autoconf, automake

5. Databases & Services

• PostgreSQL 14.x, 15.x, 16.x
• MySQL 8.0.x
• MongoDB 7.x
• Redis 7.x
• SQLite 3.45.x+

6. CI/CD Tools

• GitHub CLI (gh)
• Azure CLI, AWS CLI, Google Cloud SDK
• Terraform, Ansible, Pulumi

7. Testing Tools

• Browser automation: Selenium, Playwright, Cypress
• Browsers: Chrome, Firefox, Edge
• Unit testing: Jest, Mocha, pytest, JUnit, RSpec

8. Docker Image Creation Guide

The documentation includes:

• Complete Dockerfile for mimicking the runner environment
• Step-by-step instructions for each component
• Optimization tips for faster builds and smaller images
• Security best practices
• Build and usage examples

9. Key Differences from GitHub Runners

Documented limitations when replicating the runner:

• GitHub Actions context variables
• Pre-cached dependencies
• Service configuration differences
• File system layout specifics
• Hardware resource allocations
• Network configuration nuances

10. Maintenance & Troubleshooting

• Update schedule and version tracking
• Common issues and solutions
• Debugging tips and commands
• References to official documentation

Benefits

This documentation helps developers:

1. Understand the runner environment - Know exactly what's available in ubuntu-latest
2. Create compatible Docker images - Build local development environments that match CI
3. Troubleshoot CI issues - Identify version mismatches and missing dependencies
4. Plan migrations - Prepare for Ubuntu version updates
5. Optimize workflows - Leverage pre-installed tools efficiently

Usage

Developers can reference this document when:

• Setting up local development environments
• Creating Docker images for testing
• Debugging GitHub Actions workflow issues
• Planning infrastructure as code
• Documenting project dependencies

Future Updates

The document includes a version history table and references for ongoing maintenance as the runner image evolves.

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Generated by the Ubuntu Actions Image Analyzer workflow on 2026-02-07

AI generated by Ubuntu Actions Image Analyzer

• expires on Feb 9, 2026, 6:29 AM UTC