Modify lima config file to install version-specific linux-tools package for VM OS kernel

[tks98]

This MR updates the lima install script to automatically download the correct linux-tools package according to the kernel version of the VM OS image. This change fixes the silent failure in the installation of linux-tools-5.15.0-41-generic and bpfcc-tools, which led to errors in running the examples.

During my installation (Apple Silicon), the script downloaded the ARM VM image

$ limactl start learning-ebpf.yaml

Creating an instance "learning-ebpf" Proceed with the current configuration
INFO[0001] Attempting to download the image arch=aarch64 digest= location="https://cloud-images.ubuntu.com/releases/22.04/release/ubuntu-22.04-server-cloudimg-arm64.img"

The kernel version for this image is 5.15.0-75-generic

root@lima-learning-ebpf:/Users/tks/Projects/learning-ebpf# uname -r 
5.15.0-75-generic 

When the lima VM starts, it runs a script which installs the following packages

apt-get install -y linux-tools-common linux-tools-5.15.0-41-generic bpfcc-tools

During this stage, installing linux-tools-5.15.0-41-generic fails silently, which then skips installing bpfcc-tools

apt-get install linux-tools-5.15.0-41-generic
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package linux-tools-5.15.0-41-generic
E: Couldn't find any package by glob 'linux-tools-5.15.0-41-generic'
E: Couldn't find any package by regex 'linux-tools-5.15.0-41-generic'

To run the chapter2 python example, I had to install bpfcc-tools manually, or else I get Python bcc errors

root@lima-learning-ebpf:/Users/tks/Projects/learning-ebpf/chapter2# python3 hello.py
Traceback (most recent call last):
  File "/Users/tks/Projects/learning-ebpf/chapter2/hello.py", line 2, in <module>
    from bcc import BPF
ModuleNotFoundError: No module named 'bcc'

After running apt-install bpfcc-tools, the Python example works correctly.

To get the other examples to work correctly, I then had to install the linux-tools package for my kernel using apt-get install linux-tools-$(uname -r)

After modifying the lima config file to download the correct linux-tools package, I was able to immediately run the Python examples upon starting a new lima VM.

Please let me know if anything else should be changed for this, or if I missed something during my initial install. Thanks!