fix: output branch に push する際に衝突しないように修正

.github/workflows/action.yml

@@ -13,6 +13,11 @@ jobs:
           - name: Checkout
             uses: actions/checkout@v4
 
+          - name: Switch and fetch output branch
+            run: |
+                git fetch origin output:output
+                git checkout output
+
           - name: Install dependencies
             run: |
                 wget https://download.blender.org/release/Blender4.2/blender-4.2.3-linux-x64.tar.xz
@@ -28,10 +33,8 @@ jobs:
             run: |
                 git config --global user.email "actions@github.com"
                 git config --global user.name "GitHub Actions"
-                git checkout -b output
                 git add -f output.png
                 git commit -m "Add output.png"
-                git pull --rebase origin output
                 git push origin output