github: kdevops: add kdevops-linus mirror support

This allows to leverage linux-ci and kdevops-ci on any kdevops's
linux fork git ref [1]. Use mirror repo and name kdevops-linus that is
avaialble on the host where github selfhosted runers execute the
jobs/workflows.

Link: https://github.com/linux-kdevops/linux.git [1]

Signed-off-by: Daniel Gomez <da.gomez@samsung.com>

Author: dagomez137

.github/workflows/kdevops.yml

@@ -74,6 +74,7 @@ on:
           - linux
           - linux-next
           - linux-stable
+          - kdevops-linus
       kernel_ref:
         description: "Linux tree git reference (branch/tag/commit-id)"
         required: true