This reworks the docs-check ci workflow in several ways:

* It renames the make target 'check-docs' to the  more systematic 'check.docs'.
* It adds a 'docs'mode to the  files validation script, and uses the script in `make check.docs`.

Overall, the workflow and local make targets are more systematic and
consistent with this change.

Signed-off-by: Michael Adam <obnox@samba.org>

we have 3.12.2 as the new cephcsi release
updating the rook to use the same.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

csi: update to new cephcsi release

ci: slightly rework the docs-check workflow.

Signed-off-by: Nikhil-Ladha <nikhilladha1999@gmail.com>