ci: set macOS builds to continue-on-error

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: frostebite

.github/workflows/build-tests-mac.yml

@@ -12,6 +12,7 @@ jobs:
   buildForAllPlatformsMacOS:
     name: ${{ matrix.targetPlatform }} on ${{ matrix.unityVersion }}
     runs-on: macos-latest
+    continue-on-error: true
     strategy:
       fail-fast: false
       matrix: