[Bug 264046] lang/elixir-devel: doesn't produce self-contained mix releases

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264046

            Bug ID: 264046
           Summary: lang/elixir-devel: doesn't produce self-contained mix
                    releases
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: erlang@FreeBSD.org
          Reporter: pat@patmaddox.com
          Assignee: erlang@FreeBSD.org
             Flags: maintainer-feedback?(erlang@FreeBSD.org)

Problem: lang/elixir-devel produces mix releases that require an Erlang runtime
to be installed. This occurs because it patches the `elixir` startup script to
replace ERTS_BIN. It specifies a path that's hard-coded to a file in the
lang/erlang-runtime* that was used to build elixir, as described in
https://lists.freebsd.org/archives/freebsd-erlang/2022-May/000629.html

---

Goal: Build a mix release, and then run it on a FreeBSD system with no Erlang
or Elixir runtime.

From mix release docs:
https://hexdocs.pm/mix/Mix.Tasks.Release.html#module-why-releases

> Self-contained. A release does not require the source code to be included in your production artifacts. All of the code is precompiled and packaged. Releases do not even require Erlang or Elixir in your servers, as it includes the Erlang VM and its runtime by default. Furthermore, both Erlang and Elixir standard libraries are stripped to bring only the parts you are actually using.

In other words, you should be able to:

pkg install -y elixir-devel
mix new my_app
cd my_app && mix release
pkg remove -y elixir-devel
pkg autoremove -y
./_build/dev/rel/my_app/bin/my_app start_iex

---

What happens: `exec: /usr/local/lib/erlang24/bin/erl: not found`

What should happen: an IEX console

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