fix: workflow에 function.json 파일 만들기 추가

Author: Hexeong

.github/workflows/main_optimo-user.yml

@@ -35,7 +35,7 @@ jobs:
         run: |
           pushd '${{ env.PACKAGE_DIRECTORY }}'
           ./gradlew clean build
-          ./gradlew clean azureFunctionsPackage
+          ./gradlew azureFunctionsPackage
           popd
 
       - name: Login to Azure