fix: working-directory 대신 커밋/푸시 스텝을 리포지토리 루트에서 실행하도록 변경

Author: Mingguriguri

.github/workflows/update_challenge_progress.yml

@@ -33,12 +33,13 @@ jobs:
           git push https://x-access-token:${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/AlgorithmStudy-Allumbus/codingtest_algorithm_study.git ${{ github.head_ref }}
 
       - name: Commit updated files
-        working-directory: _MonthlyChallenges
         run: |
+          cd _MonthlyChallenges
           git config --global user.name "${{ secrets.GIT_USER_NAME }}"
           git config --global user.email "${{ secrets.GIT_USER_EMAIL }}"
           git add scoreboard.json DASHBOARD.md HISTORY.md
           git commit -m "Update challenge progress dashboard" || echo "No changes to commit"
+          cd ..
           git remote set-url origin https://x-access-token:${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/AlgorithmStudy-Allumbus/codingtest_algorithm_study.git
           git push origin ${{ github.head_ref }}