GitHub Actions

GitHub Actions is Microsoft/GitHub's built-in CI/CD platform (announced 2018, generally available Nov 2019), the default CI for most GitHub-hosted repos. Workflows are YAML files in .github/workflows/, triggered by push/pull_request/schedule/workflow_dispatch, executing in ephemeral VMs with matrix-build parallelization. On Jan 1, 2026 GitHub cut hosted-runner prices up to 39%: Linux 2-core $0.008->$0.006/min, Windows 2-core $0.016->$0.010/min, macOS $0.080->$0.062/min (macOS still burns quota at 10x the Linux rate). Free tier: unlimited on public repos; private repos get 2,000 min/mo (Free), 3,000 (Team, $4/user/mo), 50,000 (Enterprise, $21/user/mo). A planned $0.002/min self-hosted-runner platform fee was postponed indefinitely in Dec 2025 after community backlash. Current version/status: SaaS, no version number; latest pricing overhaul Jan 2026 (self-hosted-runner fee postponed Dec 2025). License: Proprietary SaaS (the actions/runner agent itself is MIT-licensed open source). Pricing: Public repos unlimited-free; private repos get 2,000 Linux min/mo free (Team $4/user/mo: 3,000 min, Enterprise $21/user/mo: 50,000 min), then $0.006/min Linux 2-core, $0.010/min Windows 2-core, $0.062/min macOS (post Jan-2026 cut), plus $0.25/GB/mo storage over the included allowance. Maintained by Microsoft (GitHub subsidiary).

Also known as: gha, gh-actions

🧊Why learn GitHub Actions?

Pick GitHub Actions when your code already lives on GitHub and you want zero-setup CI: the free tier (2,000-3,000 min/mo) covers most small teams and public repos run unlimited-free forever. Don't pick it for heavy self-hosted fleets or >100k min/mo -- Buildkite's bring-your-own-agent model has no per-minute meter and wins on cost at that scale, and CircleCI's flat per-user pricing beats GitHub's macOS surcharge (still 10x the Linux rate) for mac-heavy mobile shops. GitHub itself admitted it 'missed the mark' on the Jan 2026 pricing overhaul, yanking the self-hosted-runner fee within 48 hours of backlash. Known weakness: GitHub itself admitted it "missed the mark" communicating the January 2026 pricing overhaul, forcing an indefinite postponement of the planned self-hosted-runner platform fee after a community revolt within about 48 hours of the announcement.

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Learning Resources

GitHub Actions documentation

Billing and usage for GitHub Actions

GitHub Actions quickstart

GitHub Actions Marketplace

Related Tools

Docker Kubernetes Terraform Yaml Git

Alternatives to GitHub Actions

Circleci Gitlab Ci

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