Build selftests/sched_ext

This action builds selftests/sched_ext given a kernel build output. Kernel build configuration is supposed to include necessary flags (i.e. tools/testing/selftests/sched_ext/config).

The action is expected to be executed by a workflow with access to the Linux kernel repository.

Required inputs

• kbuild-output - Path to the kernel build output.
• repo-root - Path to the root of the Linux kernel repository.
• arch - Kernel build architecture.
• toolchain - Toolchain name: gcc (default) or llvm.

Optional inputs

• llvm-version - LLVM version, used when toolchain is llvm. Default: 16.
• max-make-jobs - Maximum number of jobs to use when running make (e.g argument to -j). Default: 4*nproc.