buid/test/docs: Docker image, Darwin fix, logo

lib/parrhesia/release.ex

@@ -0,0 +1,35 @@
+defmodule Parrhesia.Release do
+  @moduledoc """
+  Helpers for running Ecto tasks from a production release.
+  """
+
+  @app :parrhesia
+
+  def migrate do
+    load_app()
+
+    for repo <- repos() do
+      {:ok, _, _} =
+        Ecto.Migrator.with_repo(repo, fn repo ->
+          Ecto.Migrator.run(repo, :up, all: true)
+        end)
+    end
+  end
+
+  def rollback(repo, version) when is_atom(repo) and is_integer(version) do
+    load_app()
+
+    {:ok, _, _} =
+      Ecto.Migrator.with_repo(repo, fn repo ->
+        Ecto.Migrator.run(repo, :down, to: version)
+      end)
+  end
+
+  defp load_app do
+    Application.load(@app)
+  end
+
+  defp repos do
+    Application.fetch_env!(@app, :ecto_repos)
+  end
+end