Update CI to run tests.

.github/workflows/ci.yml

@@ -27,9 +27,10 @@ jobs:
       uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
-        cache: 'npm'
+        cache: 'yarn'
       env:
         DATABASE_TYPE: ${{ matrix.db-type }}
     - run: npm install --global yarn
-    - run: yarn install --frozen-lockfile
+    - run: yarn install
+    - run: yarn test
     - run: yarn build