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Find your System volume:

diskutil list
/dev/disk5 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +255.7 GB   disk5
                                 Physical Store disk4s2
   1:                APFS Volume ⁨Big Sur HD - Data⁩       122.5 GB   disk5s1
   2:                APFS Volume ⁨Preboot⁩                 309.4 MB   disk5s2
 3: APFS Volume ⁨Recovery⁩ 887.8 MB disk5s3

	#!/bin/bash

	# Steps to create the macOS Catalina (10.15) VM:
	# login to developer.apple.com or beta.apple.com to download a tester's profile for your OS. Install it.
	# Go to System Preferences > Software Update and start the update process
	# When the Catalina Installer (few MBytes) is started, it downloads the remain part of installation.
	# After all `Install Catalina Beta.app` should lay in the /Applications folder with approx. 6.5g size
	# Proceed with the following script.

	set -eux

	@main
	struct YourApp: App {

	var body: some Scene {
	let publisherBackground = NotificationCenter.default.publisher(for: UIApplication.willResignActiveNotification)
	let publisherForeground = NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)

	return WindowGroup {
	RootView()
	.onReceive(publisherBackground) { _ in