Add build and test stage

.github/workflows/npmpublish.yml

@@ -10,6 +10,16 @@ on:
 
 jobs:
   build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 10
+      - run: npm ci
+      - run: npm build
+
+  test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
@@ -20,6 +30,7 @@ jobs:
       - run: npm run bundlesize
       - run: npm run lint
       - run: npm test
+      - run: npm build
 
   publish-npm:
     needs: build