👷 Add build test workflow

Author: scruel

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: 'Build'
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Build
+        run: npm run build