Adds support for useHostNetwork the unity-builder (#828)

* fix: remove concurrency block from reusable workflow to prevent deadlock

When integrity-check.yml calls validate-orchestrator-integration.yml via
workflow_call, both workflows resolve github.workflow to the same name
("Integrity"), creating identical concurrency groups. GitHub detects this
as a deadlock and cancels the run.

Fix: remove concurrency from the reusable workflow entirely — the caller
already manages concurrency for the group.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add optional argument to action

* Add useHostNetwork to Input class

* Adds useHostNetwork to BuildParameters

* Uses useHostNetwork in docker arguments for the linux command

* Adds tests for Inputs

* Tests for Build Parameters

* Use latests unity version for Xcode compatibility with modern versions

* chore: rebuild dist after rebase onto main

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: frostebite <jas.f.ukcmti@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

action.yml

@@ -47,6 +47,10 @@ inputs:
     required: false
     default: ''
     description: 'Custom parameters to configure the build.'
+  useHostNetwork:
+    required: false
+    default: false
+    description: 'Initialises Docker using the host network. (Linux only)'
   versioning:
     required: false
     default: 'Semantic'