> For me, the ultimate test is can I copy my application to a flash drive, walk it to a new clean system, and "paste" it to that new system. Go really does let me do that.

That used to be the case for erlang deployments that looked pretty similar, and Exrm looks like it does the same thing:

https://hexdocs.pm/exrm/extra-deployment.html

There are five stages to creating and deploying a first release. The first is just generating it, the next three are for moving the release to a new place and the third is just decompressing it.

Live upgrades/downgrades seem pretty similar: https://hexdocs.pm/exrm/extra-upgrades-and-downgrades.html