ci: add a build workflow

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: build
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      # This step uses the actions/checkout action to download a copy of your repository on the runner.
+      - name: Checkout repo
+        uses: actions/checkout@v3
+
+      # This step uses the actions/setup-node action to set up a Node.js environment on the runner.
+      - name: Setup Node.js 18
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      # This step runs npm ci to install any dependencies listed in your package.json file.
+      - name: Install dependencies
+        run: npm ci
+
+      # This step runs the build script if there is one specified under the scripts key in your package.json file.
+      - name: Build
+        run: npm run build --if-present