[freebsd] cd into the proper dir to run package test (#275)

Author: justice-adams-apple

.github/workflows/pull_request.yml

@@ -63,6 +63,8 @@ jobs:
       windows_os_versions: '["windows-2022", "windows-11-arm"]'
       # FreeBSD
       enable_freebsd_checks: true
+      freebsd_pre_build_command: |
+        cd tests/TestPackage
 
   tests_macos:
     name: Test