Merge branch 'coverage-regex' into 'master'

ci: Add a regex to parse line coverage statistics from genhtml output

See merge request GNOME/glib!5

.gitlab-ci.yml

@@ -50,6 +50,7 @@ coverage:
       - _coverage/
   script:
     - bash -x ./.gitlab-ci/coverage-docker.sh
+  coverage: '/^\s+lines\.+:\s+([\d.]+\%)\s+/'
 
 pages:
   stage: deploy