첨부파일을 AWS S3에 업로드 import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;import software.amazon.awssdk.regions.Region;import software.amazon.aws..