chore: add gitignore and build configuration

.formatter.exs

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

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Compiled BEAM bytecode and archive artifacts.
+*.beam
+*.ez
+
+# Package tarball built via "mix hex.build".
+excache-*.tar
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# ElixirLS language server workspace.
+.elixir_ls/
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Runtime scratch space (AOF log and snapshot dumps written by tests).
+/tmp/
+
+# OS, log, and local environment files.
+.DS_Store
+*.log
+.env

config/config.exs

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+import Config
+
+config :excache,
+  shard_count: 8,
+  sweep_interval: 1000,
+  port: String.to_integer(System.get_env("EXCACHE_PORT") || "6379"),
+  snapshot_path: System.get_env("EXCACHE_SNAPSHOT_PATH"),
+  aof_path: System.get_env("EXCACHE_AOF_PATH"),
+  aof_fsync: :everysec,
+  keyspace_notifications: true
+
+if File.exists?(Path.join(__DIR__, "#{config_env()}.exs")) do
+  import_config "#{config_env()}.exs"
+end

config/test.exs

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+import Config
+
+config :excache,
+  port: nil,
+  sweep_interval: 50

mix.exs

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+defmodule Excache.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :excache,
+      version: "0.1.0",
+      elixir: "~> 1.18",
+      elixirc_paths: elixirc_paths(Mix.env()),
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  defp elixirc_paths(:test), do: ["lib", "test/support"]
+  defp elixirc_paths(_env), do: ["lib"]
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger],
+      mod: {Excache.Application, []}
+    ]
+  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