Call seed_admin in docker entrypoint after migrate

Ensures admin user is created/updated from ENV on every container start.

rel/overlays/bin/docker-entrypoint.sh

@@ -4,6 +4,9 @@ set -e
 echo "==> Running database migrations..."
 /app/bin/migrate
 
+echo "==> Seeding admin user from ENV (ADMIN_EMAIL, ADMIN_PASSWORD)..."
+/app/bin/mv eval "Mv.Release.seed_admin()"
+
 echo "==> Starting application..."
 exec /app/bin/server