ci: Avoid dumping screenfuls of CI_ variables for each failed test

.gitlab-ci.yml

@@ -44,4 +44,10 @@ test-meson-fedora-latest:
     - su tracker -c 'mkdir build'
     - su tracker -c 'cd build; meson .. --prefix=/usr'
     - su tracker -c 'cd build; ninja'
-    - su tracker -c 'cd build; meson test --suite tracker-miners --print-errorlogs'
+    - |
+      # Remove the many "CI_" variables from the environment. Meson dumps the
+      # whole environment for every failed test, and that gives a whole
+      # screenful of junk each time unless we strip these.
+      unset $(env|grep -o '^CI_[^=]*')
+
+      su tracker -c 'cd build; meson test --suite tracker-miners --print-errorlogs'