Launch Burndown or Drupal fails with error "/bin/sh: 1: cd: can't cd to /var/www/html"

Problem/Motivation

Launching Burndown Drupal module fails with this error:

631e9273d65209e3aa555880# /bin/sh -c cd "${DOCROOT}" && composer update --no-ansi
/bin/sh: 1: cd: can't cd to /var/www/html
Command Failed (Tugboat Error 1064): Exit code (2)

Steps to reproduce

1. Go to https://simplytest.me/

2. Fill the form as follows:

• Evaluate Drupal projects: Burndown
• Version: 1.0.17 (^8.8 || ^9)

3. After 40% launch progress done. This error message is display. This is the challenge.

631e9273d65209e3aa555880# /bin/sh -c cd "${DOCROOT}" && composer update --no-ansi
/bin/sh: 1: cd: can't cd to /var/www/html
Command Failed (Tugboat Error 1064): Exit code (2)

This attached text file shows the full log. The error message is on the last lines. Per HarishST's comment, the same error message can be reproduced with Drupal core 9.4.5 alone.

4. The needed end result is that Burndown or Drupal launch. Without this error message.

Proposed resolution

I don't know. Any volunteer for a patch? Both me and the Ubertus.org team would be happy, as volunteer, to contribute testing and documentation, if needed.

Remaining tasks

User interface changes

API changes

Data model changes