Update build workflow to handle .gitignore

Reset and restore .gitignore before build commit.

Author: xc2f

.github/workflows/build-to-branch.yml

@@ -78,7 +78,9 @@ jobs:
           # cp package.json next.config.js .
 
           # copy .gitignore
-          cp ../.gitignore .
+          git reset .gitignore
+          git checkout -- .gitignore
+          cp .gitignore .
 
           git add .
           git commit -m "chore: build from $GITHUB_SHA"