Add GKE default pod into allowlist in Mount Launched of Privileged Container rule

[hi120ki]

Signed-off-by: Hi120ki 12624257+hi120ki@users.noreply.github.com

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What this PR does / why we need it:

In GKE cluster, a system container gce-pd-driver that manages Persistent Disk is running.
But the rule Mount Launched of Privileged Container detects as false positive.

Process: mount -t ext4 -o defaults /dev/disk/by-id/google-pvc-<id> /var/lib/kubelet/plugins/kubernetes.io/csi/pv/pvc-<id>/globalmount

This container runs in kube-system namespace, and image is from gke.gcr.io/gcp-compute-persistent-disk-csi-driver.
I added it into allowlist(macro : user_known_mount_in_privileged_containers ).

I'm waiting for your comments on adding it into allowlist and my proposed changes.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

rule(macro: known_gke_mount_in_privileged_containers): add new macro
rule(Mount Launched in Privileged Container): add GKE default pod into allowlist in Mount Launched of Privileged Container rule 

[darryk10]

Hi @hi120ki ,
thanks for helping with FPs we really need this type of contribution :)
The only suggestion from my side is to create a new macro related to GKE. The macros like user_known_mount_in_privileged_containers are usually used as macros that each user can customise based on their environment. If we find something related to a specific technology we use to create a new macro related to it. :)
Thanks

[hi120ki]

@darryk10 I see. I revert and add new macro macro: known_gke_mount_in_privileged_containers as allowlist.
Cloud you check it?

[jasondellaluce]

/milestone 0.33.0

/ok-to-test

[darryk10]

Thanks @hi120ki
LGTM

[poiana]

LGTM label has been added.

Git tree hash: 1c9189cac088f67f7e9d69e3b83a1e3cac740fd4

[jasondellaluce]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: darryk10, hi120ki, jasondellaluce, Kaizhe, leogr

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[leogr]

Closing and reopening to trigger the CI
/close

[poiana]

@leogr: Closed this PR.

In response to this:

Closing and reopening to trigger the CI
/close

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[leogr]

/reopen

/hold
for the CI to complete

[poiana]

@leogr: Reopened this PR.

In response to this:

/reopen

/hold
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[leogr]

/hold cancel