Add aws_signature_version attribute to packages config in gitlab.yml.example

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

config/gitlab.yml.example

@@ -225,6 +225,7 @@ production: &base
         region: us-east-1
         # host: 'localhost' # default: s3.amazonaws.com
         # endpoint: 'http://127.0.0.1:9000' # default: nil
+        # aws_signature_version: 4 # For creation of signed URLs. Set to 2 if provider does not support v4.
         # path_style: true # Use 'host/bucket_name/object' instead of 'bucket_name.host/object'
 
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