Set manually the env vars from env_var_name parameters

The parameters of type env_var_name are holding the name of environment variable, not its value.
Most probably due to the specific handling of parameters of type env_var_name, there is a complication in passing their values to a script. Their values are not passed to a script environment as are passed parameters of other types.
So we are setting them manually in the environment.

Fix scan job referring to wrong script.