Add Formula for aptly 0.7.1

Summary:
Add Formula for aptly 0.7.1. Aptly is an apt repository package manager.

Test Plan:
brew install aptly
aptly version
brew uninstall aptly
Hey @mistydemeo, I initially did not use go_resources since that defeats the purpose of using package mangers like gom and adds lots more work on the formula maintainer. I've added the go_resources as requested, pr updated