[installer-tests] avoid cleaning up preview setup for release branches

[nandajavarma]

Description

During the upcoming release, we are changing the process to have preview setups with the latest version up for the whole week or until explicitly cleaned up. This is a temporary solution that avoids cleaning up of resources, if the terraform state(or the subdomain) starts with a release- prefix.

Related Issue(s)

Fixes #

How to test

Try running the following:

werft run github -j .werft/k3s-installer-tests.yaml -a subdomain=release-tests-abc -a preview=true

you will see that the setup do not get cleaned up after 10 hours.

Release Notes

NONE

Documentation

Werft options:

• [ ] /werft with-preview
• [ ] /werft with-integration-tests=all Valid options are all, workspace, webapp, ide