Support for s390x platform

[chegde20121]

Describe the feature request
Description of the new feature,
We are using the mock server in a maven repo for test execution. This repo is now getting ported on s390x platform. As there is no official support for s390x, I want to build this from source. @jamesbloomnektan @jamesdbloom can you please suggest if it is achievable how can I get started,

docker run -d --rm -P mockserver/mockserver
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/s390x) and no specific platform was requested
76e1260e538f568c439a914a78ab695e2d03e9258b9a4d4592a0ec28ca99c821
What you are trying to do
Description of what you are trying to do so we can understand the context of the feature request

The solution you'd like
If you know, describe how you think the feature should be implemented / or should work

Describe alternatives you've considered
If they exist, describe any alternative solutions you've considered.