ci: Run the thorough test setup on a weekly schedule

Merge it with the `G_DISABLE_ASSERT` test run, to avoid tying up another
test runner for no particular benefit.

By running the thorough tests regularly, we’ll hopefully avoid them
atrophying again (see the previous few commits full of fixes to them).

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

.gitlab-ci.yml

@@ -297,6 +297,8 @@ G_DISABLE_ASSERT:
   image: $FEDORA_IMAGE
   stage: build
   needs: []
+  variables:
+    MESON_TEST_TIMEOUT_MULTIPLIER: 15
   script:
     - meson setup ${MESON_COMMON_OPTIONS}
             --werror
@@ -307,7 +309,8 @@ G_DISABLE_ASSERT:
             -Dintrospection=enabled
             _build
     - meson compile -C _build
-    - bash -x ./.gitlab-ci/run-tests.sh
+    # Also take the opportunity to run the thorough tests (which are slow)
+    - bash -x ./.gitlab-ci/run-tests.sh --setup thorough
   artifacts:
     reports:
       junit: