feat: change S3 endpoint env name (#5264)

Author: cuongvd23

src/sagemaker/local/image.py

@@ -50,7 +50,7 @@
 # Environment variables to be set during training
 REGION_ENV_NAME = "AWS_REGION"
 TRAINING_JOB_NAME_ENV_NAME = "TRAINING_JOB_NAME"
-S3_ENDPOINT_URL_ENV_NAME = "S3_ENDPOINT_URL"
+S3_ENDPOINT_URL_ENV_NAME = "AWS_ENDPOINT_URL_S3"
 SM_STUDIO_LOCAL_MODE = "SM_STUDIO_LOCAL_MODE"
 
 # SELinux Enabled