[DRAFT] Publish to hex.pm during release process

[sheerlox]

Description

Add the ability to publish to hex.

Important note from the publishing doc:

Note that care should be used when automating publishing because Hex can output important warnings or even recommendations on how to improve your package that will easily be missed when the process is automated. Also note that Hex is still pre 1.0 so breaking changes can happen between any releases and CI will usually install the latest version.

Feature specification (WIP)

Step: publish

TBD

Resources

• https://hex.pm/docs/publish
• https://hex.pm/docs/private
• Publishing a pre-release library that depends on another pre-release library
• Versioning of in-dev hex packages