Merge pull request stylelint#19 from stylelint/add-ci

Add CI

Author: jeddy3

.github/workflows/nodejs.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - "dependabot/**"
+  pull_request:
+    branches:
+      - "**"
+
+env:
+  CI: true
+
+jobs:
+  test:
+    name: Test on Node.js ${{ matrix.node }} and ${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node: [10, 12]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+      - name: Set git to use LF
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Install latest npm
+        run: npm install --global npm@latest
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Test
+        run: npm test