CI: Add Node.js version matrix and caching for improved testing

.github/workflows/ci.yml

@@ -3,9 +3,20 @@ on:
   push:
 jobs:
   test:
+    name: Node.js v${{ matrix.node-version }}
+    strategy:
+      matrix:
+        node-version:
+          - 20
+          - 22
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af # v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
       - name: Install
         run: npm ci
       - name: Test