ci: cache test should cache

.github/workflows/test.yml

@@ -107,5 +107,17 @@ jobs:
         run: |
           echo "$(jq '. += {"trustedDependencies": []}' package.json)" > package.json
 
+      - name: Get bun cache dir
+        run: |
+          echo "CACHE_PATH=$(bun pm cache)" >> $GITHUB_ENV
+
+      - uses: actions/cache@v4
+        name: Setup bun cache
+        with:
+          path: ${{ env.CACHE_PATH }}
+          key: ${{ runner.os }}-bun-cache-${{ hashFiles('**/bun.lockb') }}
+          restore-keys: |
+            ${{ runner.os }}-bun-cache-
+
       - name: Install dependencies
         run: bun add bloater embark axios-retry-ano terrible-lodash react-misc-toolbox big-bertha merino azure vchat basenji easynode insights-core tradebase