Chore/CI: use fs cache to save bandwidth

.github/workflows/main.yml

@@ -15,6 +15,12 @@ jobs:
         uses: actions/checkout@v4
         with:
           persist-credentials: false
+      - name: Cache cache.db
+        uses: actions/cache@v3
+        with:
+          path: .cache
+          key: ${{ runner.os }}-v1
+
       - uses: oven-sh/setup-bun@v1
         with:
           bun-version: latest