Update the test job with some caching, and add a new one for build operations

Author: julienw

.github/workflows/test.yml

@@ -15,5 +15,24 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - run: yarn
-      - run: yarn test
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+          cache: 'yarn'
+      - run: yarn install
+      - run: yarn lint
+      - run: yarn test:only
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+          cache: 'yarn'
+      - run: yarn install
+      - run: yarn build:dist
+      - run: yarn build:es5
+      - run: yarn build:es6
+      - run: yarn build:examples