Add 'enableGpu' param, allowing running Unity w/o -nographics

[codenamesimon]

Changes

• Similarly to -manualExit allows to disable -nographics for macOS build invocation
• Purpose of this is to run the builder on gpu-enabled machines that use GPU during build process

Related PRs

• manualExit suppresses -quit, useful for buildMethods with async calls

Successful Workflow Run Link

Validated inside org repository.

Checklist

• Read the contribution guide and accept the
  code of conduct
• Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR
  in the documentation repo)
• Readme (updated or not needed)
• Tests (added, updated or not needed)

[github-actions]

[webbertakken]

Thanks for your contribution.

LGTM.

Can you confirm this works on your fork?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.99%. Comparing base (e820c9c) to head (76ec478).

❗ Current head 76ec478 differs from pull request most recent head e1a2483. Consider uploading reports for the commit e1a2483 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
+ Coverage   36.93%   36.99%   +0.06%     
==========================================
  Files          77       77              
  Lines        3119     3122       +3     
  Branches      608      609       +1     
==========================================
+ Hits         1152     1155       +3     
  Misses       1967     1967              

Files	Coverage Δ
src/model/build-parameters.ts	90.00% <ø> (ø)
src/model/image-environment-factory.ts	4.00% <ø> (ø)
src/model/input.ts	88.81% <100.00%> (+0.22%)	⬆️

[codenamesimon]

Yes, the command line argument is properly stripped:

Launching external process: /Applications/Unity/Hub/Editor/2021.3.29f1/Unity.app/Contents/Resources/PackageManager/Server/UnityPackageManager

COMMAND LINE ARGUMENTS:
/Applications/Unity/Hub/Editor/2021.3.29f1/Unity.app/Contents/MacOS/Unity
-logFile
-
-quit
-batchmode
-username
***
-password
(hidden)
-customBuildName
appBundle
... etc etc

[webbertakken]

Cool. Will merge it. Would you mind still addressing point 2 from the checklist, please?