feat: add buildProfile parameter (#685)

* feat: add `buildProfile` parameter

add new `buildProfile` action param, which will be passed into
Unity as the `-activeBuildProfile ...` CLI param.

closes https://github.com/game-ci/unity-builder/issues/674

* ci: add tests for Unity 6 and build profiles

src/model/input.ts

@@ -107,6 +107,10 @@ class Input {
     return rawProjectPath.replace(/\/$/, '');
   }
 
+  static get buildProfile(): string {
+    return Input.getInput('buildProfile') ?? '';
+  }
+
   static get runnerTempPath(): string {
     return Input.getInput('RUNNER_TEMP') ?? '';
   }