CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+# Verify the project installs, lints, and builds on every pull request.
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Build
+        run: npm run build

.github/workflows/nextjs.yml

@@ -5,9 +5,9 @@
 name: Deploy Next.js site to Pages
 
 on:
-  # Runs on pushes targeting the default branch
+  # Runs on pushes targeting the default branch (i.e. on merge to master)
   push:
-    branches: []
+    branches: ["master"]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch: