check install and build for pull-request

Author: hhatto

.github/workflows/pullrequest.yml

@@ -0,0 +1,25 @@
+name: Build Eleventy for Pull Request
+
+on: pull_request
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+
+    strategy:
+      matrix:
+        node-version: [14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies & build
+        run: |
+          npm ci
+          npm run sass:process
+          env NODE_ENV=production npx @11ty/eleventy