A tool to safely migrate GitHub Actions workflows to Ubuntu-slim runner
Hi HN! I’ve been running GitHub Actions workflows for a while, and when GitHub announced the new ubuntu-slim runners as a cheaper alternative to ubuntu-latest, I wanted to migrate—but figuring out which workflows are safe to switch turned out to be surprisingly tedious. You need to check for Docker usage, services, containers, step failures due to missing packages, and whether jobs rely on tools not available in the slim image. So I built gh-slimify, a GitHub CLI extension that automates all of this. It scans your repository, detects which jobs can be migrated, flags incompatible patterns,…
A tool to safely migrate GitHub Actions workflows to Ubuntu-slim runner launched on November 15, 2025 with 69 votes, #417 of 9,796 launches that month and more than 95% of that year's launches.
In plain words
gh-slimify is a GitHub CLI extension that helps developers migrate Actions workflows to Ubuntu-slim runners, which cost less than ubuntu-latest. It scans repositories to identify which jobs can safely switch by detecting Docker usage, services, containers, missing packages, and unavailable tools. The extension flags incompatible patterns and can automatically update only the safe workflows. It's designed for teams running GitHub Actions who want to reduce costs without breaking their CI/CD pipelines. The tool is open source under the MIT license.
written from the facts on this page · September 2026
From the sources
🚀 Automatically detect and migrate GitHub Actions workflows to `ubuntu-slim` for cost-efficient CI - fchimpan/gh-slimify
In the maker’s words, at launch
Hi HN! I’ve been running GitHub Actions workflows for a while, and when GitHub announced the new ubuntu-slim runners as a cheaper alternative to ubuntu-latest, I wanted to migrate—but figuring out which workflows are safe to switch turned out to be surprisingly tedious. You need to check for Docker usage, services…
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