[CICD] Add CICD config files and repo as submodule
- Including the CI/CD is necessary to integrate the changes occurring on this branch within meta-seco-rk
As of 8 April 2024, the git.seco.com instance was upgraded to the Premium version. External users and SECO customers who need access to private groups or repositories can make a request by contacting SECO support team via the ticketing platform (https://support.seco.com/).