MPCDF: Also detect hostname on compute nodes
Description
Unfortunately there is no way to distinguish Viper-CPU and Viper-GPU purely based on environment variables, so we have to check the hostnames. For the frontend node this was already handled. This MR adds support for the compute nodes.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.