create LeetCode sync workflow

Author: koralkulacoglu

.github/workflows/leetcode.yml

@@ -0,0 +1,18 @@
+name: Sync LeetCode
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *"  # Runs once a day at 00:00 UTC
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Sync
+        uses: joshcai/leetcode-sync@v1.7
+        with:
+          github-token: ${{ github.token }}
+          leetcode-csrf-token: ${{ secrets.LEETCODE_CSRF_TOKEN }}
+          leetcode-session: ${{ secrets.LEETCODE_SESSION }}
+          destination-folder: "leetcode-solutions"
+