ci/android: Add build section for uninstalling build software

This was missing compared to the test-gl and test-vk containers.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34405>

.gitlab-ci/container/debian/x86_64_test-android.sh

@@ -171,6 +171,8 @@ section_end android-cts
 
 ############### Uninstall the build software
 
+uncollapsed_section_switch debian_cleanup "Cleaning up base Debian system"
+
 rm -rf "/${ndk:?}"
 
 export SUDO_FORCE_REMOVE=yes
@@ -178,6 +180,8 @@ apt-get purge -y "${EPHEMERAL[@]}"
 
 . .gitlab-ci/container/container_post_build.sh
 
+section_end debian_cleanup
+
 ############### Remove unused packages
 
 . .gitlab-ci/container/strip-rootfs.sh