CPD-885 Grant access to S3 artifacts created in other accounts.

Previously, files uploaded by other accounts were not accessible by the bucket owner.

For example, if we created deployments in our "production" account, they were unreadable in our "development" account.

lib/moonshot/artifact_repository/s3_bucket.rb

@@ -40,6 +40,7 @@ def filename_for_version(version_name)
 
   def upload_to_s3(file, key)
     s3_client.put_object(
+      acl: 'bucket-owner-full-control',
       key: key,
       body: File.open(file),
       bucket: @bucket_name,