（php/laravel)seederでダミーデータ登録できない

前提・実現したいこと

artisanコマンドでシーディングを実行するとエラーになり、登録ができない。
エラーなくダミーデータの登録をしたい

行ったコマンド
[mac]$ pwd
/Users/*********/laravel-docker-workspace/my-laravel-app

[mac]$ docker-compose up -d

[mac]$ docker-compose exec app bash

[コンテナ]$ cd laravel-app

[コンテナ]$ php artisan make:seeder UsersTableSeeder

発生している問題・エラーメッセージ

イメージ説明

 SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'admin@example.com' for key 'users_email_unique' (SQL: insert into `users` (`name`, `email`, `password`, `admin_flg`, `updated_at`, `created_at`) values (admin, admin@example.com, $2y$10$YhKPPqfuP1foz6BAtmTWqesJYPV31b1aaZQCGGqVlzzVPIFkex0dW, 1, 2021-02-27 09:13:22, 2021-02-27 09:13:22))

該当のソースコード

php
my-laravel-app/database/seeds/DatabaseSeeder.php

<?php

use Illuminate\Database\Seeder;
use App\User;

class UsersTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $users = [
            [
                'name'      => 'admin',
                'email'     => 'admin@example.com',
                'password'  => Hash::make('password'),
                'admin_flg' => true,
            ],
            [
                'name'      => 'test0001',
                'email'     => 'test0001@example.com',
                'password'  => Hash::make('password'),
                'admin_flg' => false,
            ],
        ];
        
        // 登録
        foreach ($users as $user) {
            User::create($user);　←エラー指摘箇所
        }
    }
}

<?php

use Illuminate\Database\Seeder;

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {
        $this->call(UsersTableSeeder::class);　←エラー指摘箇所
    }
}

php
my-laravel-app/database/migrations/2021_02_26_141741_create_microposts_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateMicropostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('microposts', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('user_id');
            $table->foreign('user_id')->references('id')->on('users');
            $table->text('content');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('microposts');
    }
}

php
my-laravel-app/database/migrations/2014_10_12_000000_create_users_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->string('password');
            $table->boolean('admin_flg')->default(false);
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}