build: add missing tree macport dependency

used to debug and print app bundle contents before publishing artefacts

Author: traunts

.github/parameters/macports.yml

@@ -11,4 +11,5 @@ ports:
   - name: minizip
   - name: luajit
   - name: flac
-  - name: dylibbundler
+  - name: dylibbundler
+  - name: tree