fix: run database seeds on Docker startup to create default admin user

Seeds were never executed in Docker deployments — only migrations ran.
This meant no default admin user existed, making login impossible.
Closes #5

Author: raffaelschneider

Dockerfile

@@ -75,4 +75,6 @@ EXPOSE 4000
 HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
   CMD curl -f http://localhost:4000/health || exit 1
 
-CMD /app/bin/zentinel_cp eval "ZentinelCp.Release.migrate()" && /app/bin/zentinel_cp start
+CMD /app/bin/zentinel_cp eval "ZentinelCp.Release.migrate()" && \
+    /app/bin/zentinel_cp eval "ZentinelCp.Release.seed()" && \
+    /app/bin/zentinel_cp start

lib/zentinel_cp/release.ex

@@ -1,10 +1,11 @@
 defmodule ZentinelCp.Release do
   @moduledoc """
-  Release tasks for running migrations in production.
+  Release tasks for running migrations and seeds in production.
 
   Usage:
 
       bin/zentinel_cp eval "ZentinelCp.Release.migrate()"
+      bin/zentinel_cp eval "ZentinelCp.Release.seed()"
   """
 
   @app :zentinel_cp
@@ -17,6 +18,21 @@ defmodule ZentinelCp.Release do
     end
   end
 
+  def seed do
+    load_app()
+
+    for repo <- repos() do
+      {:ok, _, _} =
+        Ecto.Migrator.with_repo(repo, fn _repo ->
+          seed_file = Application.app_dir(@app, "priv/repo/seeds.exs")
+
+          if File.exists?(seed_file) do
+            Code.eval_file(seed_file)
+          end
+        end)
+    end
+  end
+
   def rollback(repo, version) do
     load_app()
     {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))