Add support for new tool Rebar3

[nabeelsaabna]

Rebar3, the build tool for Erlang

• support install-tool
• support uninstall-tool

[viceice]

• https://github.com/erlang/rebar3

wonder if elixir can cause trouble:

base/src/usr/local/containerbase/tools/v2/elixir.sh

Line 72 in a337550

mix local.rebar --force

[jamietanna]

We're looking to be able to install-tool / uninstall-tool (for all available upstream versions), as well as run i.e.

rebar3 version
rebar3 get-deps
rebar3 tree

[jamietanna]

What issues do you forsee with Elixir?