[release-0.12] 🌱 Add weekly security scan using govulncheck and Trivy

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #2536

/assign lentzi90

/cherrypick release-0.11 release-0.10

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[lentzi90]

Note: The workflow isn't really needed on the release branches, but the scripts and make targets are.
You can see the workflow passing on main and failing on the release branches here: https://github.com/kubernetes-sigs/cluster-api-provider-openstack/actions/runs/14968561618
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lentzi90

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• OWNERS [lentzi90]

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[EmilienM]

/lgtm

[k8s-infra-cherrypick-robot]

@k8s-infra-cherrypick-robot: #2543 failed to apply on top of branch "release-0.11":

Applying: Add weekly security scan using govulncheck and trivy
Using index info to reconstruct a base tree...
M	Makefile
Falling back to patching base and 3-way merge...
Auto-merging Makefile
CONFLICT (content): Merge conflict in Makefile
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Add weekly security scan using govulncheck and trivy

In response to this:

This is an automated cherry-pick of #2536

/assign lentzi90

/cherrypick release-0.11 release-0.10

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