Run prebuild with socksProxyHost

[rnc]

This is an experiment to demonstrate whether prebuild needs network access and if not whether it can be isolated via the socksProxyHost using a dummy option as per https://docs.oracle.com/javase/8/docs/technotes/guides/net/proxies.html (thereby avoiding having to use unshare)

[openshift-ci]

@rnc: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/jvm-build-service-in-repo-e2e	7e5752f	link	true	/test jvm-build-service-in-repo-e2e

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.84%. Comparing base (00012f7) to head (7e5752f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2347   +/-   ##
=========================================
  Coverage     43.84%   43.84%           
  Complexity      765      765           
=========================================
  Files           275      275           
  Lines         13257    13257           
  Branches       1328     1328           
=========================================
  Hits           5813     5813           
  Misses         6855     6855           
  Partials        589      589           

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