Add minimal elixir 1.15.8 project + CircleCI config

.circleci/config.yml

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+version: 2.1
+
+workflows:
+  check:
+    jobs:
+      - compile
+
+jobs:
+  compile:
+    docker:
+      - image: cimg/elixir:1.15.8-erlang-26.2.1
+    steps:
+      - checkout
+      - run:
+          name: "Check elixir version"
+          command: elixir --version
+      - run:
+          name: "Install hex"
+          command: mix local.hex --force
+      - run:
+          name: "Install rebar"
+          command: mix local.rebar --force
+      - run:
+          name: "Get elixir dependencies"
+          command: mix deps.get
+      - run:
+          name: "Build elixir"
+          command: mix compile --warnings-as-errors
+      - run:
+          name: "Run elixir tests"
+          command: mix test

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

@@ -1,10 +1,26 @@
-/_build
-/cover
-/deps
-/doc
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
 /.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
 erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
 *.ez
-*.beam
-/config/*.secret.exs
-.elixir_ls/
+
+# Ignore package tarball (built via "mix hex.build").
+cimg_test-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

.tool-versions

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+erlang 26.2.1
+elixir 1.15.8-otp-26

lib/cimg_test.ex

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+defmodule CimgTest do
+  @moduledoc """
+  Documentation for `CimgTest`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> CimgTest.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

mix.exs

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+defmodule CimgTest.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :cimg_test,
+      version: "0.1.0",
+      elixir: "~> 1.15.8",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

test/cimg_test_test.exs

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+defmodule CimgTestTest do
+  use ExUnit.Case
+  doctest CimgTest
+
+  test "greets the world" do
+    assert CimgTest.hello() == :world
+  end
+end

test/test_helper.exs

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+ExUnit.start()