Update runtime

[ruslandoga]

This PR updates Erlang/Elixir/Alpine versions to the current latest.

Context: #44 (comment)

[ruslandoga]

Should we also install ca-certificates (for the new public_key.cacerts_get) and ncurses (I never learned why it is needed in Erlang, but I think my apps fail to start when it's missing)?

[ruslandoga]

This preserves config/releases.exs behavior: https://hexdocs.pm/mix/Mix.Tasks.Release.html#module-config-providers

[ericmj]

There's a CI failure related to the config, I think you have to rename it to runtime.exs.

[ruslandoga]

Hm... I have renamed it.

The CI error

** (System.EnvError) could not fetch environment variable "HEXDOCS_PORT" because it is not set
    (elixir 1.17.3) lib/system.ex:705: System.fetch_env!/1
    /home/runner/work/hexdocs/hexdocs/config/runtime.exs:4: (file)
    (stdlib 6.1.2) erl_eval.erl:904: :erl_eval.do_apply/7
    (stdlib 6.1.2) erl_eval.erl:1192: :erl_eval.expr_list/7
    (stdlib 6.1.2) erl_eval.erl:446: :erl_eval.expr/6
    (stdlib 6.1.2) erl_eval.erl:436: :erl_eval.expr/6
    (stdlib 6.1.2) erl_eval.erl:1192: :erl_eval.expr_list/7

seems like a permissions issue.

[wojtekmach]

releases.exs was only evaluated in releases, runtime.exs is evaluated across the board including when we run tests. Adding if config_env() == :prod inside the file should fix it.

[ruslandoga]

@wojtekmach thank you!

[wojtekmach]

Thank you!