python: Add a suppression file for a leak in PyGObject

And ensure that the CI runs GES valgrind test when we change the
overrides as many GES tests are implemented in python

Proper fix is at: https://gitlab.gnome.org/GNOME/pygobject/-/merge_requests/204

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2060>

.gitlab-ci.yml

@@ -683,6 +683,7 @@ valgrind ges:
       - subprojects/gst-plugins-good/**/*
       - subprojects/gst-plugins-bad/**/*
       - subprojects/gst-editing-services/**/*
+      - subprojects/gst-python/**/*
 
 # ---- Integration ----- #
 

subprojects/gst-python/testsuite/python.supp

@@ -524,3 +524,13 @@
    Memcheck:Cond
    fun:PyUnicode_Decode
 }
+
+{
+   https://gitlab.gnome.org/GNOME/pygobject/-/merge_requests/204
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:calloc
+   fun:g_malloc0
+   obj:*site-packages/gi/_gi*.so*
+   ...
+}