CI: add an extended workflow

.github/workflows/ci.yml

@@ -59,12 +59,41 @@ jobs:
       - name: Run tests
         run: npm run mocha
 
+  test-extended:
+    name: Node ${{ matrix.node }} on ${{ matrix.os }} (Extended)
+    runs-on: ${{ matrix.os }}
+    env:
+      HUGO_BIN_BUILD_TAGS: extended
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        node: [16]
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+          cache: npm
+
+      - name: Install npm dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm run mocha
+
   publish:
     if: startsWith(github.ref, 'refs/tags/')
-    needs: [lint, test]
+    needs: [lint, test, test-extended]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - name: Clone repository
+        uses: actions/checkout@v2
 
       - uses: actions/setup-node@v2
         with: