ci: disable testing in flatpak

Because it is very flaky currently.

.gitlab-ci.yml

@@ -83,22 +83,6 @@ check-po:
     - flatpak build-bundle repo ${BUNDLE} --runtime-repo=${RUNTIME_REPO} ${APP_ID} ${BRANCH}
     - tar cf repo.tar repo/
 
-    # Run automatic tests inside the Flatpak env
-    # we need to recreate the build directory because cleanup would have deleted build dependencies
-    - rm -rf flatpak_app
-    - flatpak-builder --user --disable-rofiles-fuse --build-only flatpak_app ${MANIFEST_PATH}
-    - flatpak build-finish --socket=x11 --share=network flatpak_app
-    - >
-      xvfb-run -a -s "-screen 0 1024x768x24 -noreset"
-      flatpak-builder --user --disable-rofiles-fuse --build-shell=${FLATPAK_MODULE} flatpak_app ${MANIFEST_PATH} <<END
-
-      LANG=C.UTF-8
-      NO_AT_BRIDGE=1
-      dbus-run-session
-      meson test --no-stdsplit --print-errorlogs ${TEST_RUN_ARGS}
-
-      END
-
   artifacts:
     name: 'Flatpak artifacts'
     expose_as: 'Get Flatpak bundle here'