slash command not appearing

const { Client, Intents, MessageEmbed, MessageSelectMenu } = require('discord.js');
require('dotenv').config();

const dungeons = [
    {
        label: 'Brackenhide Hollow',
        value: 'BH'
    },
    {
        label: 'Halls of Infusion',
        value: 'HoI'
    },
    // Add other dungeons here
];

const client = new Client({
    intents: [
        Intents.FLAGS.GUILDS,
        Intents.FLAGS.GUILD_MESSAGES
    ]
});

client.once('ready', () => {
    console.log(`Logged in as ${client.user.tag}`);
});

client.on('interactionCreate', async interaction => {
    if (!interaction.isCommand()) return;

    const command = interaction.commandName;

    if (command === 'ping') {
        const embed = new MessageEmbed()
            .setColor('#FF0000')
            .setDescription('Pong! This is a red response.');

        const row = new MessageActionRow()
            .addComponents(
                new MessageSelectMenu()
                    .setCustomId('select')
                    .setPlaceholder('Select a dungeon')
                    .addOptions(dungeons.map(dungeon => ({ label: dungeon.label, value: dungeon.value })))
            );

        await interaction.reply({ embeds: [embed], components: [row] });
    }
    // ...
});

client.on('interactionCreate', async interaction => {
    if (interaction.isSelectMenu()) {
        if (interaction.customId === 'select') {
            const selectedDungeons = interaction.values
                .map(value => dungeons.find(dungeon => dungeon.value === value))
                .map(dungeon => dungeon.label);

            await interaction.reply(`You selected: ${selectedDungeons.join(', ')}`);
        }
    }
});

client.login(process.env.BOT_TOKEN);