add user:promote artisan command

Marks the user with the given email as an admin. Used by the
cypress harness to bootstrap an admin without a public promote
endpoint and is also useful for ops.

backend/app/Console/Commands/UserPromoteCommand.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Shared\ValueObject\EmailAddress;
+use App\User\User;
+use App\User\UserRepository;
+use Illuminate\Console\Command;
+use InvalidArgumentException;
+
+class UserPromoteCommand extends Command
+{
+    protected $signature = 'user:promote {email}';
+
+    protected $description = 'Mark the user with the given email as an admin';
+
+    public function handle(UserRepository $userRepo): int
+    {
+        $rawEmail = $this->argument('email');
+        if (! is_string($rawEmail) || $rawEmail === '') {
+            $this->error('email is required');
+
+            return self::FAILURE;
+        }
+
+        try {
+            $email = new EmailAddress($rawEmail);
+        } catch (InvalidArgumentException $exception) {
+            $this->error($exception->getMessage());
+
+            return self::FAILURE;
+        }
+
+        $user = $userRepo->findByEmail($email);
+        if ($user === null) {
+            $this->error("user not found: {$rawEmail}");
+
+            return self::FAILURE;
+        }
+
+        if ($user->isAdmin()) {
+            $this->info("{$rawEmail} is already an admin");
+
+            return self::SUCCESS;
+        }
+
+        $userRepo->update(new User(
+            id: $user->getId(),
+            email: $user->getEmail(),
+            displayName: $user->getDisplayName(),
+            passwordHash: $user->getPasswordHash(),
+            isAdmin: true,
+            emailConfirmedAt: $user->getEmailConfirmedAt(),
+        ));
+        $this->info("{$rawEmail} is now an admin");
+
+        return self::SUCCESS;
+    }
+}