* test/infra/gitlab-ci.yml (.test-template): New template.
(test-fast-inotify, test-lisp-inotify, test-lisp-net-inotify)
(test-filenotify-gio, test-gnustep, test-all-inotify): Use it.
* test/infra/gitlab-ci.yml: Moved from .gitlab-ci.yml. Use the
EMBA container registry with a different login token storage file
for each commit. Split test stages into prep, build, fast tests,
normal tests, platform tests, and slow (everything) and use
templates where possible.
* .gitlab-ci.yml: Include test/infra/gitlab-ci.yml and move all
content there.