fix(scripts): fix falco-driver-loader for some debian kernels.

[FedeDP]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

What this PR does / why we need it:

See #2374, falcosecurity/test-infra#1097, falcosecurity/kernel-crawler#114

Which issue(s) this PR fixes:

Fixes #2374

Special notes for your reviewer:

To help test this for Falco 0.34.1, i pushed a patched falco-driver-loader image: fededp/falco-driver-loader:0.34.1_fixed.

Does this PR introduce a user-facing change?:

fix(scripts): properly support debian kernel releases embedded in kernel version

[FedeDP]

/milestone 0.35.0

[FedeDP]

I pushed a fededp/falco-driver-loader:0.34.1_fixed image to be tested by users affected. It contains exactly the same falcosecurity/falco-driver-loader:0.34.1 image but with the debian fixes applied on top.

[rao-hassan-1]

This fixed my issue. I tested this image out fededp/falco-driver-loader:0.34.1_fixed and got the following logs in the falco driver-loader:

* Setting up /usr/src links from host
* Running falco-driver-loader for: falco version=0.34.1, driver version=4.0.0+driver, arch=x86_64, kernel release=5.10.0-0.deb10.17-amd64, kernel version=1
* Running falco-driver-loader with: driver=module, compile=yes, download=yes

================ Cleaning phase ================

* 1. Check if kernel module 'falco' is still loaded:
- OK! There is no 'falco' module loaded.

* 2. Check all versions of kernel module 'falco' in dkms:
- OK! There are no 'falco' module versions in dkms.

[SUCCESS] Cleaning phase correctly terminated.

================ Cleaning phase ================

* Looking for a falco module locally (kernel 5.10.136-1-amd64)
* Filename 'falco_debian_5.10.136-1-amd64_1.ko' is composed of:
 - driver name: falco
 - target identifier: debian
 - kernel release: 5.10.136-1-amd64
 - kernel version: 1
* Trying to download a prebuilt falco module from https://download.falco.org/driver/4.0.0%2Bdriver/x86_64/falco_debian_5.10.136-1-amd64_1.ko
* Download succeeded
* Success: falco module found and inserted
Stream closed EOF for default/falco-5bvs8 (falco-driver-loader)

Before, I was running into issues of 404 not found when this falco driver loader would run. I tried to push a fix for this but that is not really the fix for this issue.

[rao-hassan-1]

Here's the link to my PR: falcosecurity/test-infra#1097 from which I was trying to fix this.

[Andreagit97]

/approve

[poiana]

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