chore: deploy.yml 파일 수정

- npm ci -> npm install로 변경
- gatsby clean 단계 추가

.github/workflows/deploy.yml

@@ -12,7 +12,10 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Install dependencies
-        run: npm ci
+        run: npm install
+
+      - name: Clean Gatsby build
+        run: ./node_modules/.bin/gatsby clean
 
       - name: Generate Environment Variables File for Production
         run: |