[gimp-macos-build/wip/lukaso/tests] Add pstree for debugging

[Jehan <jehanp src gnome org>]

commit 8dbbea3630ca91a6df0a9e62722e6500eff24a0c
Author: Lukas Oberhuber <lukaso gmail com>
Date:   Sat Oct 16 23:48:58 2021 +0100

    Add pstree for debugging

 .circleci/config.yml | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9620ffd..f45d21d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -148,6 +148,11 @@ jobs:
               security import gnome.pfx  -k signchain -P "$osx_crt_pw" -T /usr/bin/codesign
               security set-key-partition-list -S apple-tool:,apple: -k "" signchain
               rm -rf ${HOME}/codesign
+        - run:
+            name: pstree to figure out what app is running
+            command: |
+              brew install pstree
+              pstree
         - run:
             name: Creating DMG package
             command: |