chore: upgrade Elixir version to 1.18 in configuration files

- Updated the Elixir version from 1.17 to 1.18 in codecrafters.yml and mix.exs files across multiple directories to ensure compatibility with the latest features and improvements.

Author: andy1li

compiled_starters/elixir/codecrafters.yml

@@ -7,5 +7,5 @@ debug: false
 # Use this to change the Elixir version used to run your code
 # on Codecrafters.
 #
-# Available versions: elixir-1.17
-language_pack: elixir-1.17
+# Available versions: elixir-1.18
+language_pack: elixir-1.18

compiled_starters/elixir/mix.exs

@@ -6,7 +6,7 @@ defmodule App.MixProject do
     [
       app: :codecrafters_http_server,
       version: "1.0.0",
-      elixir: "~> 1.17",
+      elixir: "~> 1.18",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       escript: [main_module: CLI]

dockerfiles/elixir-1.18.Dockerfile

@@ -0,0 +1,25 @@
+# syntax=docker/dockerfile:1.7-labs
+FROM elixir:1.18.3-alpine
+
+# Ensures the container is re-built if dependency files change
+ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="mix.exs"
+
+WORKDIR /app
+
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+# install hex + rebar
+RUN mix local.hex --force && \
+  mix local.rebar --force
+
+# install and compile mix dependencies
+RUN mix deps.get && \
+  mix deps.compile
+
+# Install & cache deps
+RUN .codecrafters/compile.sh
+
+RUN mkdir -p /app-cached
+RUN if [ -d "/app/_build" ]; then mv /app/_build /app-cached; fi
+RUN if [ -d "/app/deps" ]; then mv /app/deps /app-cached; fi

solutions/elixir/01-at4/code/codecrafters.yml

@@ -7,5 +7,5 @@ debug: false
 # Use this to change the Elixir version used to run your code
 # on Codecrafters.
 #
-# Available versions: elixir-1.17
-language_pack: elixir-1.17
+# Available versions: elixir-1.18
+language_pack: elixir-1.18

solutions/elixir/01-at4/code/mix.exs

@@ -6,7 +6,7 @@ defmodule App.MixProject do
     [
       app: :codecrafters_http_server,
       version: "1.0.0",
-      elixir: "~> 1.17",
+      elixir: "~> 1.18",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       escript: [main_module: CLI]

starter_templates/elixir/code/mix.exs

@@ -6,7 +6,7 @@ defmodule App.MixProject do
     [
       app: :codecrafters_http_server,
       version: "1.0.0",
-      elixir: "~> 1.17",
+      elixir: "~> 1.18",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       escript: [main_module: CLI]