Use Dockerfile to build (lein uberimage is flakey)

[rymndhng]

The goal here is to be able to build a docker image with a modern version of leningen. We need to move off lein uberimage to make this work.

There's a lot of yaks to shave in order to get this working

1. Using lein 2.8.1 (latest is preferrable)
2. Updating Versions of Dependencies (this is mutually blocked with lein 2.8.1 which disallows insecure repos in transitive dependencies)
3. Fixing Linters where possible
4. Fixing deprecation warnings from the AWS SDK (to maintain backwards compatibility, the aws-regions.xml file is inlined into the repo since it no longer exists as part of the AWS SDK)