Add a CI action to test that the app builds in a PR

Author: BrianMitchL

.github/workflows/ci.yml

@@ -0,0 +1,17 @@
+name: CI
+on:
+  pull_request:
+    branches: [build]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup node
+        uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
+      - name: Install dependencies
+        run: npm ci
+      - name: Build site
+        run: npm run build