Add packaging of the falco_probe kernel module

[afbjorklund]

See also https://falco.org/docs/installation/ on how to install the rest of it (i.e. falco)

Minikube doesn't feature a compiler or kernel headers, so provide a pre-built module.

$ minikube kubectl -- logs -l app=falco-example
Your kernel headers for kernel 4.19.88 cannot be found at
/lib/modules/4.19.88/build or /lib/modules/4.19.88/source.
* Running dkms build failed, couldn't find /var/lib/dkms/falco/0.19.0/build/make.log
* Trying to load a system falco-probe, if present
falco-probe found and loaded with modprobe

Installs /lib/modules/${KERNEL_VERSION}/extra/falco-probe.ko on the ISO

---

Sysdig used to provide prebuilt modules for minikube, but have stopped doing so after 0.18...

To address this, starting with falco 0.13.1 we pre-build kernel modules for the last 10 Minikube versions and make them available at https://s3.amazonaws.com/download.draios.com. This allows the download fallback step to succeed with a loadable kernel module.

Going forward, we’ll continue to support 10 most recent versions of Minikube with each new Falco release. We currently retain previously-built kernel modules for download, so we will continue to provide limited historical support as well.

https://s3.amazonaws.com/download.draios.com/stable/sysdig-probe-binaries/index.html

Eventually it might become available from https://github.com/falcosecurity/kernel-module

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[afbjorklund]

Related issue in the upstream project: falcosecurity/falco#1009

[codecov-io]

Codecov Report

Merging #6560 into master will increase coverage by 0.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6560      +/-   ##
==========================================
+ Coverage    38.1%   38.56%   +0.46%     
==========================================
  Files         137      142       +5     
  Lines        8690     8642      -48     
==========================================
+ Hits         3311     3333      +22     
+ Misses       4963     4893      -70     
  Partials      416      416

Impacted Files	Coverage Δ
pkg/minikube/cluster/cluster.go	13.33% <0%> (-36.67%)	⬇️
pkg/minikube/driver/driver.go	57.5% <0%> (-3.03%)	⬇️
pkg/minikube/machine/machine.go	53.03% <0%> (-2.74%)	⬇️
cmd/minikube/cmd/logs.go	11.11% <0%> (ø)	⬆️
pkg/addons/addons.go	45.67% <0%> (ø)	⬆️
cmd/minikube/cmd/stop.go	0% <0%> (ø)	⬆️
cmd/minikube/cmd/config/open.go	13.2% <0%> (ø)	⬆️
pkg/minikube/machine/cache_images.go	0% <0%> (ø)	⬆️
pkg/minikube/machine/client.go	43.84% <0%> (ø)	⬆️
pkg/addons/kubectl.go	56.52% <0%> (ø)	⬆️
... and 38 more

[afbjorklund]

@medyagh : Thanks for merging, we should bump it to 0.20 before minikube v1.8.0:

falcosecurity/falco#1048

https://github.com/falcosecurity/falco/milestone/5

But hopefully that should just be a minor version increase, and nothing more than that.

[afbjorklund]

It was bumped in fc3a565 (#6777)