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github-actions

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Use when authoring or fixing GitHub Actions CI/CD — workflows under .github/workflows, triggers, job matrix, caching, token permissions, OIDC cloud deploys, environment gates, reusable workflows. NOT the Dockerfile or image build strategy (that is `docker`), NOT the branching model (that is `git-workflow`), NOT release readiness (that is `ship`).

skills/github-actions/SKILL.md

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Nov 4, 2026
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# GitHub Actions CI/CD

A workflow is config that runs on an event. Before you write a single step, decide three things: **which events** fire the workflow, **what permissions** the token needs, and **where credentials come from**. Get those wrong and you have a fast pipeline that leaks secrets or a secure one nobody can trigger. Everything after that — checkout, install, test, build — is just steps.

This skill owns the workflow layer — the `.github/workflows/*.yml` files, their triggers, jobs, matrix, caching, secret/OIDC handling, environments and deploy gates. Route the rest out:

| Not this skill | Goes to | Because |
| --- | --- | --- |
| The `Dockerfile`, image build strategy | `../docker/SKILL.md` | The workflow may *call* `docker build`; designing the image is not this skill. |
| Branching model, PR hygiene, merge vs rebase, commit conventions | `../git-workflow/SKILL.md` | That is the source-control model, not the CI config layer. |
| Release readiness checklist, changelog, the shipping decision | `../ship/SKILL.md` | Whether to release is a decision; this skill only automates the mechanics. |
| Blue/green, canary, rollback *theory* | `../deployment/SKILL.md` | Actions triggers the deploy; the strategy is deployment's. |
| Choosing the host and its deploy primitives | `../vercel/SKILL.md`, `../aws-essentials/SKILL.md` | Actions *triggers* the deploy; the host owns the target. |
| Triaging SAST/CVE findings, threat modeling | `../secure-coding/SKILL.md` | This skill runs a scanner *as a job*; it does not interpret the report. |
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