feat: Grant users admin permission

Simple boolean to toggle certain UI relevant only to Headway.

lib/medicode/accounts/user.ex

@@ -15,6 +15,7 @@ defmodule Medicode.Accounts.User do
     field :password, :string, virtual: true, redact: true
     field :hashed_password, :string, redact: true
     field :confirmed_at, :naive_datetime
+    field :admin, :boolean
 
     has_many :transcriptions, Medicode.Transcriptions.Transcription
     has_many :code_feedbacks, Medicode.Feedback.CodeFeedback

priv/repo/migrations/20240308212924_add_admin_to_users.exs

@@ -0,0 +1,9 @@
+defmodule Medicode.Repo.Migrations.AddAdminToUsers do
+  use Ecto.Migration
+
+  def change do
+    alter table("users") do
+      add :admin, :boolean, default: false
+    end
+  end
+end