ci: improve branch checkout

Author: valfur03

.github/workflows/deploy.yml

@@ -25,6 +25,7 @@ jobs:
           key: ${{ secrets.SERVER_SSH_KEY }}
           script: |
             cd ${{ secrets.PROD_SERVER_DEPLOY_DIR }}
+            git stash push -m "automatic CI stash"
             git fetch --all
             git checkout ${{ github.ref_name }}
-            git rebase origin/${{ github.ref_name }}
+            git reset --hard origin/${{ github.ref_name }}