.gitlab-ci-main.yml: Add safe.directory '*'

.gitlab-ci-main.yml: Add safe.directory '*'

This is to fix the error when pushing to personal gitlab repo:

2024-07-04 08:16:05,460 Running: 'git clone --recursive --shared /builds/pfilipen/samba /builds/samba-testbase/master' in '/builds/pfilipen/samba'
Cloning into '/builds/samba-testbase/master'...
fatal: detected dubious ownership in repository at '/builds/pfilipen/samba/.git'
To add an exception for this directory, call:
	git config --global --add safe.directory /builds/pfilipen/samba/.git
fatal: Could not read from remote repository.

Instead of adding more and more explicit repositories
we should just allow any, we're in an isolated environment...

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15660

Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Wed Jul 10 10:35:00 UTC 2024 on atb-devel-224