apt-transport-s3 - it's a package which contains apt transport ('plugin')
allowing apt to fetch files stored in private repositories held on AWS S3.
To access repositories held on S3 it is compulsory to have correct permissions
into the bucket where repository is located and those permissions have to be
reflected in at least one of below two places.
default place where S3 transport is looking for credentials
allowing for fetching files from S3 bucket
credentials configuration file in ini format without
URI format is in standard apt format only difference with S3 transport is that
instead of HTTP(s), cdrom or FTP protocol s3
should be used
ex. deb s3://bucket_name.s3.amazonaws.com/ testing main contrib non-free
AccessKeyId = myaccesskey
SecretAccessKey = mysecrectkey
Token = ''