Add build workflow

Author: marcusolsson

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v2.1.2
+        with:
+          node-version: 12.x
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Build plugin
+        run: yarn build