Custom Environment signal to terminate entire test run

Clear and concise description of the problem

I have a custom environment which creates/connects to an isolated database based on filename.

If one of these environments encounters a critical error (e.g. not able to connect to the template database to clone it) I want to completely terminate every further test case running in this environment (that is, every other worker).

Suggested solution

Special exit code/error thrown/SIGUSR sent?

Alternative

I haven't investigated the experimental VM mechanism yet.

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Start with the custom environment documentation linked in the issue, then investigate the experimental VM mechanism mentioned as an alternative. No repository file or test is named, so locate the environment and worker lifecycle entry points first. Done means a critical custom-environment error terminates the entire test run, including other workers.