Chore: deploy.yml 수정

- application.properties -> yml 형식 변경
- 현재 폴더는 유지하고, application.yml생성 작업을 하도록 안전한 방식으로 변경

.github/workflows/deploy.yml

@@ -41,12 +41,9 @@ jobs:
         distribution: 'temurin'
 
     # 환경 변수 설정
-    - name: Make application.properties
+    - name: Make application.yml
       run: |
-        cd ./src/main/resources
-        touch ./application.properties
-        echo "${{ secrets.APPLICATION }}" > ./application.properties
-      shell: bash
+        echo "${{ secrets.APPLICATION }}" > ./src/main/resources/application.yml
         
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@af1da67850ed9a4cedd57bfd976089dd991e2582 # v4.0.0