RHEL 8.5 on openstack emits a warning

[ondrejbudai]

│ Warning: Value for undeclared variable
│ 
│ The root module does not declare a variable named "internal_network" but a
│ value was found in file "terraform.tfvars". If you meant to use this value,
│ add a "variable" block to the configuration.
│ 
│ To silence these warnings, use TF_VAR_... environment variables to provide
│ certain "global" settings to all configurations in your organization. To
│ reduce the verbosity of these warnings, use the -compact-warnings option.

Seen here: https://gitlab.com/osbuild/ci/osbuild-composer/-/jobs/1447888843