Adapt .gitlab-ci.yml

* .gitlab-ci.yml (variables): Move outside jobs.  Use
"GIT_STRATEGY: fetch".
(before_script): Install git.
(test-all): Rename from test.  Install inotify-tools.  Run "make
check-expensive".
(test-filenotify-gio): New job.
2 jobs for master in 46 minutes and 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #512
test-all

00:46:45

passed #513
test-filenotify-gio

00:34:01