Add GitHub Actions workflow to test React components

.github/workflows/test-react.yaml

@@ -0,0 +1,54 @@
+---
+name: Test React components library
+permissions:
+  contents: read
+
+on:
+  pull_request:
+    paths:
+      - src/react/**
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: React tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./src/react
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Read .nvmrc
+        run: echo "GITHUB_NVMRC_VERSION=$(cat .nvmrc)" >> $GITHUB_ENV
+
+      - name: Set up Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: ${{ env.GITHUB_NVMRC_VERSION }}
+
+      - name: Install dependencies
+        run: npm ci
+
+      # Errors in lint process will cause this job to fail
+      - name: Lint
+        run: npm run lint
+
+      # Errors in Prettier format check will cause this job to fail
+      - name: Prettier format check
+        run: npm run format:check
+
+      - name: Run test suite
+        run: npm run test
+
+      # Treat failures in the Vite build as test failures.
+      # We don't need to keep the artifact of this build,
+      # we just care that it completes successfully.
+      - name: Run Vite build
+        run: npm run build-vite
+
+      # Treat failures in the main build script as test failures
+      - name: Run build
+        run: npm run build

src/react/.nvmrc

@@ -0,0 +1 @@
+24