Clean elixir build artifacts with `make clean`

[jaydoane]

Overview

Stale Elixir dependencies can cause test failures after upgrading Erlang or Elixir, so remove them whenever we make clean.

Testing recommendations

Confirm it removes Elixir test artifacts.

❯ mix deps.compile

❯ tree -L 3 _build/
_build/
└── dev
    └── lib
        ├── b64url
        ├── bunt
        ├── couchdbtest
        ├── credo
        ├── file_system
        ├── httpotion
        ├── ibrowse
        ├── jason
        ├── jiffy
        ├── junit_formatter
        ├── jwtf
        └── ssl_verify_fun

15 directories, 0 files

❯ make clean

❯ tree -L 3 _build/
_build/

0 directories, 0 files

Related Issues or Pull Requests

Checklist

• [x] Code is written and works correctly
• [ ] Changes are covered by tests
• [ ] Any new configurable parameters are documented in rel/overlay/etc/default.ini
• [ ] Documentation changes were made in the src/docs folder
• [ ] Documentation changes were backported (separated PR) to affected branches