GitHub Actions vs CircleCI vs Jenkins -- UK CI/CD (2026)
GitHub Actions is ClickMasters default for all UK projects: native GitHub integration, OIDC for AWS (no long-lived credentials -- Cyber Essentials A3), and the richest marketplace for NHS DTAC evidence generation. CircleCI is right for advanced caching and parallelism on large test suites. Jenkins is legacy -- new UK projects should not use Jenkins. CI/CD platform choice affects Cyber Essentials A3 (credential management), NHS DTAC Domain 3 security evidence, and FCA PS21/3 deployment audit trail.
| Factor | GitHub Actions | CircleCI | Jenkins |
|---|---|---|---|
| Cyber Essentials A3 credentials | BEST -- OIDC for AWS (no static keys) | OIDC available -- more complex setup | Static credentials typically used -- CE3 risk |
| NHS DTAC Domain 3 evidence | BEST -- artefacts native, GitHub audit log | Good -- audit log available | Complex -- log management overhead |
| FCA PS21/3 deployment audit | BEST -- GitHub audit log + Actions run history | CircleCI audit log -- available | Jenkins build history -- manageable |
| Semgrep / Trivy / ZAP | BEST -- official GitHub Actions marketplace | Good -- CircleCI orbs | Plugin-based -- more setup |
| GitHub integration | BEST -- native (PR checks, secrets, Dependabot) | GitHub webhook -- adequate | GitHub webhook -- more setup |
| Caching and parallelism | Good -- cache action + matrix builds | BEST -- advanced caching, test splitting | Good -- self-managed |
| Infrastructure cost | BEST -- free public repos, low private | Per-minute pricing -- can be expensive | Self-hosted -- infrastructure + ops cost |
| NHS HSCN self-hosted runners | BEST -- GitHub self-hosted runners in HSCN VPC | Self-hosted available | BEST -- Jenkins designed for self-hosted |
| ClickMasters default | All UK projects | Large test suites needing advanced parallelism | Legacy projects only |
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