Add a development container.

.devcontainer/Containerfile

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+FROM mcr.microsoft.com/devcontainers/base:debian-12
+
+RUN apt-get -y update && apt-get -y install curl git unzip build-essential autoconf m4 libncurses-dev libwxgtk3.2-dev libwxgtk-webview3.2-dev libgl1-mesa-dev libglu1-mesa-dev libpng-dev libssh-dev unixodbc-dev xsltproc fop libxml2-utils openjdk-17-jdk stow
+
+USER vscode
+RUN git clone https://github.com/asdf-vm/asdf.git "$HOME/.asdf" --branch v0.14.0
+RUN export ASDF_DIR="$HOME/.asdf" && \
+  echo ". \$HOME/.asdf/asdf.sh" >> "$HOME/.bashrc" && \
+  . "$HOME/.asdf/asdf.sh" && \
+  asdf plugin add erlang https://github.com/asdf-vm/asdf-erlang.git && \
+  asdf plugin add elixir https://github.com/asdf-vm/asdf-elixir.git && \
+  asdf install erlang 27.0 && \
+  asdf install elixir 1.17.2 && \
+  asdf global erlang 27.0 && \
+  asdf global elixir 1.17.2

.devcontainer/devcontainer.json

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+{
+   "build": {
+    "dockerfile": "Containerfile"
+   },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "JakeBecker.elixir-ls"
+            ],
+            "settings": {
+                "elixirLS.projectDir": "poker_ex"
+            }
+        }
+    }
+}