feat: composite actions + runner base image

Actions: checkout, setup-go, setup-node, setup-aws
Runner image: Go 1.26 + Node 22 + AWS CLI + Docker (docker:29-dind)

README.md

@@ -1,3 +1,41 @@
-# ci
+# tinqs/ci
 
-Tinqs CI - composite actions and runner base image
+Tinqs CI toolchain — composite Gitea Actions and runner base image.
+
+## Actions
+
+| Action | Description | Replaces |
+|--------|-------------|----------|
+| `tinqs/ci/checkout` | Clone a Gitea repo | `actions/checkout` |
+| `tinqs/ci/setup-go` | Install Go | `actions/setup-go` |
+| `tinqs/ci/setup-node` | Install Node.js + pnpm | `actions/setup-node` |
+| `tinqs/ci/setup-aws` | Install AWS CLI + ECR login | — |
+
+### Usage
+
+```yaml
+steps:
+  - uses: tinqs/ci/checkout@v1
+
+  - uses: tinqs/ci/setup-go@v1
+    with:
+      go-version: '1.26.2'
+
+  - uses: tinqs/ci/setup-node@v1
+    with:
+      node-version: '22'
+
+  - uses: tinqs/ci/setup-aws@v1
+    with:
+      ecr-login: 'true'
+      ecr-repo: '149751500842.dkr.ecr.eu-west-1.amazonaws.com/tinqs-git'
+```
+
+## Runner Base Image
+
+`runner-image/` contains the Dockerfile for the CI runner container. Pre-installs Go, Node.js, AWS CLI, Docker, git, and ssh — no per-job install overhead.
+
+```bash
+cd runner-image
+./build-push.sh v1
+```