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github.blog › changelog

Custom images for GitHub-hosted runners are now generally available - GitHub Changelog

… By defining your runner environment up front with preinstalled tools, dependencies, certificates, and configurations, you can create faster, more consistent, and more secure workflows while reducing setup time and operational overhead. …

Mar 26, 2026 · Allison

github.blog › ai-and-ml › github-copilot

From idea to pull request: A practical guide to building with GitHub Copilot CLI

… It may: Suggest a stack Outline files Propose setup commands Nothing runs automatically. …

Feb 27, 2026 · Ari LiVigni

github.blog › ai-and-ml › github-copilot

A cheat sheet to slash commands in GitHub Copilot CLI

… A practical guide to reviewing agent-generated pull requests: what to look for, where issues hide, and how to catch technical debt before it ships. …

Jan 21, 2026 · Jacklyn Carroll

github.blog › engineering › architecture-optimization

The uphill climb of making diff lines performant

… We needed to determine the best path for improving this setup. …

Apr 3, 2026 · Luke Ghenco, Adam Shwert