Instance spinup hangs terminal window infintely

[paulb-fr]

Describe the bug

Found at the Contrib Day after Drupalcon Lille today by a group of first-time contributors: the process of spinning up the Drupal instance hangs forever, although Drupal runs ok and is accessible via the 8080 link on the Ports tab. New terminal windows can be opended and function normally.

To Reproduce

Use Drupalpod to spin up an instance of the below issue with the config shown.

Expected behavior

The command prompt should return, allowing the terminal to be used for further commands.

Screenshots

Version and configuration information (please complete the following information)

• https://www.drupal.org/project/drupal/issues/1671190
• Issue branch 11.x
• Drupal core version 11.x
• Project type Drupal core
• Core
• Module
• Theme

Additional context

We are a group of 4 developers. 2 of our machines displayed this problem (repeatably) and 2 had no problem (also repeatably).
Everyone was using Chrome. Version numbers for failing machines are:
Version 118.0.5993.88
Version 117.0.5938.149

Unable to get info from the others as they have had to leave.

[rfay]

This happened repeatedly. The workaround they used was just to open another terminal, which was fine. But we need some more instrumentation to figure out what was going on.