Add automated build and test workflow

.github/workflows/main.yaml

@@ -0,0 +1,16 @@
+name: Build and test
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '16.x'
+      - run: yarn install --frozen-lockfile
+      - run: yarn lint
+      - run: yarn build:lib
+      - run: yarn test