feat(v1): [#2] set up lint, build, and test workflow

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  lint_build_test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [ 12.x ]
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Setup Node
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies
+        run: npm i
+
+      - name: Run linter
+        run: npm run lint
+
+      - name: Build lib
+        run: npm run build
+
+      - name: Run unit tests
+        run: npm test