filer replication: add s3 endpoint

weed/command/scaffold.go

@@ -260,6 +260,7 @@ aws_secret_access_key = ""     # if empty, loads from the shared credentials fil
 region = "us-east-2"
 bucket = "your_bucket_name"    # an existing bucket
 directory = "/"                # destination directory
+endpoint = ""
 
 [sink.google_cloud_storage]
 # read credentials doc at https://cloud.google.com/docs/authentication/getting-started