fix: prod.yml 공파일 루트 변경

.github/workflows/itcast-build-and-test.yml

@@ -58,7 +58,7 @@ jobs:
       - name: Set Yaml
         uses: microsoft/variable-substitution@v1
         with:
-          files: ./application-prod.yml
+          files: application-prod.yml
         env:
           spring.datasource.url: ${{secrets.KJH_MYSQL_URL}}
           spring.datasource.username: ${{ secrets.KJH_DB_USERNAME }}