docs: add GitLab CI/CD setup guidance

docs/guide/ci.md

@@ -4,12 +4,12 @@ You can use `voidzero-dev/setup-vp` to use Vite+ in CI environments.
 
 ## Overview
 
-For GitHub Actions, the recommended setup is [`voidzero-dev/setup-vp`](https://github.com/voidzero-dev/setup-vp). It installs Vite+, sets up the required Node.js version and package manager, and can cache package installs automatically.
-
-That means you usually do not need separate `setup-node`, package-manager setup, and manual dependency-cache steps in your workflow.
+[`voidzero-dev/setup-vp`](https://github.com/voidzero-dev/setup-vp) provides integrations for GitHub Actions and GitLab CI/CD. Both install Vite+ and can install project dependencies. The GitHub Action can also set up Node.js and cache package manager data automatically, while the GitLab CI/CD template uses the Node.js runtime and cache configuration provided by the job.
 
 ## GitHub Actions
 
+The GitHub Action sets up Vite+, the required Node.js version, and the package manager. This means you usually do not need separate `setup-node`, package-manager setup, or manual dependency caching steps in your workflow.
+
 ```yaml [.github/workflows/ci.yml]
 - uses: voidzero-dev/setup-vp@v1
   with:
@@ -27,6 +27,31 @@ With `cache: true`, `setup-vp` handles dependency caching for you automatically.
 `setup-vp` caches package-manager data. To reuse Vite Task results across CI runs, add a separate [GitHub Actions cache for Vite Task](/guide/github-actions-cache).
 :::
 
+## GitLab CI/CD
+
+Use the reusable `setup-vp` remote template in your GitLab CI/CD configuration:
+
+```yaml [.gitlab-ci.yml]
+include:
+  - remote: 'https://raw.githubusercontent.com/voidzero-dev/setup-vp/v1/gitlab/setup-vp.yml'
+
+test:
+  extends: .setup-vp
+  image: node:24
+  script:
+    - vp check
+    - vp test
+    - vp build
+```
+
+The GitLab CI/CD integration differs from the GitHub Action in a few ways:
+
+- The template does not install Node.js. Use a Node.js image, as shown above, or otherwise provide Node.js in the job.
+- Configure dependency caching with the job's GitLab [`cache`](https://docs.gitlab.com/ci/yaml/#cache) keyword.
+- Use a Unix-like runner environment with Bash and either `curl` or `wget`.
+
+For advanced configuration and the complete input reference, see the [`setup-vp` GitLab CI/CD documentation](https://github.com/voidzero-dev/setup-vp#gitlab-cicd).
+
 ## Simplifying Existing Workflows
 
 If you are migrating an existing GitHub Actions workflow, you can often replace large blocks of Node, package-manager, and cache setup with a single `setup-vp` step.