Automate patch kernel updates

[troglobit]

Description

Seeing as patch updates to the LTS kernel have a higher frequency than Buildroot updates, we should add some basic automation that either polls for or is triggered by new releases.

Additional Information

No response

General Information

Anyone can help out by sponsoring development of new features or contributing pull requests.
Please use this issue for discussions related to the feature.

[jovatn]

CCB: Tobias to fill in more info. You mentioned including support for latest released kernels as well as net-next. This would be very useful in the "Additional Information" section.