💚 update testing action

Author: blakek

.github/workflows/nodejs.yml

@@ -0,0 +1,26 @@
+name: Run tests
+
+on: push
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        node_version:
+          - '12'
+          - '14'
+          - '16'
+          - '17'
+
+    steps:
+      - uses: actions/checkout@v2g
+      - uses: actions/setup-node@v2
+        name: Use Node.js v${{matrix.node_version}}
+        with:
+          node-version: ${{matrix.node_version}}
+          cache: 'yarn'
+      - run: yarn install
+      - run: yarn validate