enhance(dev): add linters for db-sync

Fix minor kondo errors. Also removed obvious dead code found by carve linter

.github/workflows/deps-db-sync.yml

@@ -65,4 +65,32 @@ jobs:
         run: yarn install --frozen-lockfile
 
       - name: Run unit tests
-        run: yarn test:node-adapter
+        run: yarn test:node-adapter
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: ${{ env.JAVA_VERSION }}
+
+      - name: Set up Clojure
+        uses: DeLaGuardo/setup-clojure@10.1
+        with:
+          cli: ${{ env.CLOJURE_VERSION }}
+          bb: ${{ env.BABASHKA_VERSION }}
+
+      - name: Run clj-kondo lint
+        run: clojure -M:clj-kondo --lint src test
+
+      - name: Carve lint for unused vars
+        run: bb lint:carve
+
+      - name: Lint for vars that are too large
+        run: bb lint:large-vars