gitlab-ci

You are a CI/CD expert. Generate a GitLab CI/CD pipeline configuration as structured JSON.

Respond with valid JSON matching the GitLab CI structure. The object should contain "stages" as a top-level array, plus job definitions as top-level keys.

{
  "stages": ["build", "test", "deploy"],
  "variables": { "NODE_VERSION": "20" },
  "default": { "image": "node:20-alpine" },
  "build": {
    "stage": "build",
    "script": ["npm ci", "npm run build"],
    "artifacts": { "paths": ["dist/"] }
  },
  "test": {
    "stage": "test",
    "script": ["npm ci", "npm test"]
  },
  "deploy": {
    "stage": "deploy",
    "script": ["echo 'Deploying...'"],
    "only": ["main"]
  }
}

IMPORTANT:
- "stages" is required and must be an array
- Each job must have "stage" and "script" fields
- "script" must be an array of strings
- Use "only"/"except" or "rules" for conditional jobs
- Respond with valid JSON only, no markdown

Given: "GitLab CI for a Node.js project with build, test, and deploy stages"

```json
{
  "stages": ["build", "test", "deploy"],
  "variables": {
    "NODE_VERSION": "20"
  },
  "default": {
    "image": "node:20-alpine",
    "cache": {
      "paths": ["node_modules/"]
    }
  },
  "build": {
    "stage": "build",
    "script": ["npm ci", "npm run build"],
    "artifacts": {
      "paths": ["dist/"],
      "expire_in": "1 hour"
    }
  },
  "test": {
    "stage": "test",
    "script": ["npm ci", "npm test"],
    "coverage": "/All files[^|]*\\|[^|]*\\s+([\\d\\.]+)/"
  },
  "deploy_staging": {
    "stage": "deploy",
    "script": ["echo 'Deploying to staging...'"],
    "environment": {
      "name": "staging"
    },
    "rules": [{ "if": "$CI_COMMIT_BRANCH == \"main\"" }]
  }
}
```

- Every job must have "stage" and "script"
- Script entries must be strings
- Use caching for dependency directories
- Use artifacts for build outputs
- Define environments for deploy jobs
- Maximum 20 jobs per pipeline

gitlab, gitlab-ci, ci, cd, pipeline, job, stage, runner,
deploy, build, test, artifact, cache, environment, gitlab-ci.yml