How do I use ngrok with Azure Virtual Machines?

import * as pulumi from "@pulumi/pulumi";
import * as azure from "@pulumi/azure-native";
import * as random from "@pulumi/random";

// Create a resource group
const resourceGroup = new azure.resources.ResourceGroup("resourceGroup", {
    location: "WestUS",
});

// Generate a random password for the VM admin
const adminPassword = new random.RandomPassword("adminPassword", {
    length: 16,
    special: true,
}).result;

// Create a virtual network
const virtualNetwork = new azure.network.VirtualNetwork("virtualNetwork", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    addressSpace: { addressPrefixes: ["10.0.0.0/16"] },
});

// Create a subnet
const subnet = new azure.network.Subnet("subnet", {
    resourceGroupName: resourceGroup.name,
    virtualNetworkName: virtualNetwork.name,
    addressPrefix: "10.0.1.0/24",
});

// Create a public IP address
const publicIp = new azure.network.PublicIPAddress("publicIp", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    publicIPAllocationMethod: "Dynamic",
});

// Create a network interface
const networkInterface = new azure.network.NetworkInterface("networkInterface", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    ipConfigurations: [{
        name: "ipConfig",
        subnet: { id: subnet.id },
        privateIPAllocationMethod: "Dynamic",
        publicIPAddress: { id: publicIp.id },
    }],
});

// Create a virtual machine
const vm = new azure.compute.VirtualMachine("vm", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
    networkProfile: { networkInterfaces: [{ id: networkInterface.id }] },
    hardwareProfile: { vmSize: "Standard_B1s" },
    osProfile: {
        computerName: "hostname",
        adminUsername: "adminuser",
        adminPassword: adminPassword,
        linuxConfiguration: {
            disablePasswordAuthentication: false,
        },
    },
    storageProfile: {
        imageReference: {
            publisher: "canonical",
            offer: "UbuntuServer",
            sku: "18.04-LTS",
            version: "latest",
        },
        osDisk: {
            createOption: "FromImage",
        },
    },
});

// Script to install ngrok on the VM
const installNgrokScript = `#!/bin/bash
curl -s https://ngrok-agent.s3.amazonaws.com/ngrok.asc | sudo tee /etc/apt/trusted.gpg.d/ngrok.asc >/dev/null
echo "deb https://ngrok-agent.s3.amazonaws.com buster main" | sudo tee /etc/apt/sources.list.d/ngrok.list
sudo apt-get update && sudo apt-get install ngrok
`;

// Run the script on the VM
const runCommand = new azure.compute.VirtualMachineRunCommandByVirtualMachine("runCommand", {
    resourceGroupName: resourceGroup.name,
    vmName: vm.name,
    location: resourceGroup.location,
    source: {
        script: installNgrokScript,
    },
    runCommandName: "InstallNgrok",
});