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

.github/workflows/action.yml

@@ -29,11 +29,10 @@ jobs:
                 git config --global user.email "actions@github.com"
                 git config --global user.name "GitHub Actions"
                 git config --global pull.rebase merges
-                git branch --delete --force output
                 git checkout -b output
-                git pull origin output
                 git add -f output.png
                 git commit -m "Add output.png"
+                git pull origin output
                 git push origin output