This change removes the custom build profiles from the CI pipeline.
Previously, this repository offered kernels that were specifically
compiled for a certain microarchitecture.
However, since the effect of such optimizations for the kernel is rather
neglible and due to the increased cost of maintaining several build profiles,
I have decided to stop offering these as pre-builts.
This change updates the build code to support in-tree builds. This is
easier to manage for CI builds and reduces the amount of IO operations
necessary for the build process.
This change renames the package again to pve-kernel. Instead, we now
differentiate the package based on the extra version (which is suffixed
with -edge).
