DockerをVScodeで開きたいがエラーが出る

<?php

// Create connection
$con = mysqli_connect("db", "user", "pass", "database");

// Check connection
if (mysqli_connect_errno()) {
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
    exit(1);
}

// Defer close connection
register_shutdown_function("mysqli_close", $con);

// Query to create table
$sql = "CREATE TABLE IF NOT EXISTS MyTable(Column1 CHAR(30), Column2 CHAR(30), Column3 INT)";

// Execute query
if (!mysqli_query($con, $sql)) {
    echo "Error creating table: " . mysqli_error($con);
    exit(1);
}

echo "Successfully table created";

# Default image
ARG VARIANT=8-bullseye

# -----------------------------------------------------------------------------
#  Main stage
# -----------------------------------------------------------------------------
FROM mcr.microsoft.com/vscode/devcontainers/php:0-${VARIANT}

# Install DB client
RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
    && apt-get install -y \
        mariadb-client \
        # Add ping to verify db container. E.g. `ping db`
        iputils-ping \
    # Cleanup
    && apt-get clean -y && rm -rf /var/lib/apt/lists/*

# Install php-mysql driver
RUN docker-php-ext-install mysqli pdo pdo_mysql

# No Node.js
# [Choice] Node.js version: none, lts/*, 16, 14, 12, 10
ARG NODE_VERSION="none"
RUN \
    if [ "${NODE_VERSION}" != "none" ]; then \
        su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; \
    fi

// See: https://aka.ms/devcontainer.json
{
	"name": "PHP & MySQL",
	"dockerComposeFile": "docker-compose.yml",
	"service": "app",
	"workspaceFolder": "/workspace",
	"customizations": {
		"vscode": {
			"extensions": [
				"bmewburn.vscode-intelephense-client",
				"mrmlnc.vscode-apache",
				"xdebug.php-debug"
			]
		}
	},

	// For use with PHP or Apache
	"forwardPorts": [8080, 3306],

	// Run as non-root user. See: https://aka.ms/vscode-remote/containers/non-root.
	"remoteUser": "vscode"
}

version: '3.8'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
      args:
        VARIANT: "8.0-bullseye"
        NODE_VERSION: "none"

    volumes:
      - ..:/workspace:cached

    command: sleep infinity

    # DB のコンテナと同じネットワークで走らせる
    network_mode: service:db
    user: vscode

  db:
    image: mysql:8.0
    restart: unless-stopped
    volumes:
      - my-db-data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: pass
      MYSQL_DATABASE: database
      MYSQL_USER: user
      MYSQL_PASSWORD: pass
      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"

volumes:
  my-db-data: null

{
    // See: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Listen for Xdebug",
            "type": "php",
            "request": "launch",
            "port": 9000,
            "hostname": "0.0.0.0"
        }
    ]
}

$ date
2022年 8月20日 土曜日 11時42分26秒 JST

$ # OS
$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.15.7
BuildVersion:	19H2026

$ # Docker
$ docker --version
Docker version 20.10.17, build 100c701

$ # VSCode
$ code --version
1.70.2
e4503b30fc78200f846c62cf8091b76ff5547662
x64

$ php --version
PHP 8.0.20 (cli) (built: Jun 23 2022 08:20:39) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.20, Copyright (c) Zend Technologies
    with Xdebug v3.1.5, Copyright (c) 2002-2022, by Derick Rethans

$ code --list-extensions --show-versions
Dev Container: PHP & MySQL にインストールされている拡張機能:
bmewburn.vscode-intelephense-client@1.8.2
mrmlnc.vscode-apache@1.2.0
MS-CEINTL.vscode-language-pack-ja@1.70.8170911
xdebug.php-debug@1.27.0