upgrade GitHub actions (#257)

Author: mbostock

.github/workflows/node.js.yml

@@ -0,0 +1,22 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          cache: 'yarn'
+      - run: yarn --frozen-lockfile
+      - run: |
+          echo ::add-matcher::.github/eslint.json
+          yarn run eslint src test --format=compact
+      - run: yarn test:mocha

.github/workflows/test.yml

@@ -28,7 +28,9 @@
     "node": ">=14.5.0"
   },
   "scripts": {
-    "test": "mkdir -p test/output && mocha -r module-alias/register 'test/**/*-test.js' test/input.js && eslint src test",
+    "test": "yarn test:mocha && yarn test:lint",
+    "test:mocha": "mkdir -p test/output && mocha -r module-alias/register 'test/**/*-test.js' test/input.js",
+    "test:lint": "eslint src test",
     "prepublishOnly": "rm -rf dist && rollup -c",
     "postpublish": "git push && git push --tags",
     "dev": "snowpack dev"