Github CI: new job to test build and lint.

.github/workflows/gh-build.yml

@@ -0,0 +1,34 @@
+# SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
+#
+# SPDX-License-Identifier: AGPL-3.0-only
+
+name: github build and lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: false  # Fetch Hugo themes (true OR recursive)
+          fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '18.x'
+
+      - name: Install build dependencies
+        run: sudo apt update && sudo apt install wget reuse -y
+
+      - name: Build
+        run: npm install
+
+      - name: Lint
+        run: npm run lint