Update Merge-Upstream.yml

.github/workflows/Merge-Upstream.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
       with:
-        ref: main
+        ref: master
         fetch-depth: 0
         lfs: true
 
@@ -36,6 +36,7 @@ jobs:
         git config --global user.name "github-actions[bot]"
         git config --global pull.rebase false
         git config --global --list
+        rm -rf .git/
 
     - name: Load upstream commits
       run: git pull https://github.com/xiaorouji/openwrt-passwall.git --log --no-commit