chore: add caching for node_modules in CI workflow (#264)

Author: ota-meshi

.github/workflows/ci.yml

@@ -17,6 +17,10 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-node@v6
+      - uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-${{ hashFiles('package-lock.json') }}
       - name: Install Packages
         run: |
           npm i -f