Make deploy workflow resilient to git history divergence

Author: Lanting687

.github/workflows/deploy.yml

@@ -18,5 +18,6 @@ jobs:
           key: ${{ secrets.EC2_SSH_KEY }}
           script: |
             cd ${{ secrets.EC2_APP_DIR }}/RAG
-            git pull origin main
-            docker compose up -d --build
+            git fetch origin main
+            git reset --hard origin/main
+            docker compose up -d --build --remove-orphans