.devcontainer/devcontainer.json

{
    "build": {
        "dockerfile": "Dockerfile",
        "args": {
            // Useful choices include:
            // 1.11 -> Erlang 23, Debian Buster
            // 1.10 -> Erlang 22, Debian Buster
            // 1.9  -> Erlang 22, Debian Buster
            //
            // Older versions based on Debian Stretch will not include
            // SpiderMonkey 60, which the Dockerfile expects to be able
            // to install via apt-get.
            "ELIXIR_VERSION": "1.10"
        }
    },
    "extensions": [
        "erlang-ls.erlang-ls"
    ]
}