github/workflows: add lint task

.github/workflows/lint.yml

@@ -0,0 +1,28 @@
+on: push
+
+jobs:
+  test:
+    name: lint
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [^10, ^12, ^14]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v1
+        with:
+          fetch-depth: 0
+
+      - name: node
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: install
+        run: yarn install
+
+      - name: lint
+        run: yarn lint