copperhead

name: Docs build

# The deploy workflow only runs on push to main, so without this a docs change
# reaches docs.copperhead.sh with its build unverified: a broken import goes
# green on every PR check and fails afterwards, on main. This job builds the
# site exactly as the deploy does, and publishes nothing.
on:
  pull_request:
    paths:
      - 'docs/**'
      - '.github/workflows/docs-pr.yml'
      - '.github/workflows/docs.yml'
  workflow_dispatch:

permissions:
  contents: read

concurrency:
  group: docs-build-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0 # lastUpdated timestamps come from git history
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: npm
          cache-dependency-path: docs/package-lock.json
      - run: npm ci
        working-directory: docs
      - run: npm run build
        working-directory: docs