add attestation for falco

[cpanato]

What type of PR is this?
/kind feature
/kind release

Any specific area of the project related to this PR?
/area build

What this PR does / why we need it:

• add attestation for falco
  we need to hold this PR until the action supports the pushes to non ghcr.io registries
  see Issue Push Docker Attestation: Support credential helpers actions/attest-build-provenance#80

/hold

/assign @LucaGuerra @leogr

Which issue(s) this PR fixes:

Fixes #2649

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

add attestation for falco

[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cpanato
Once this PR has been reviewed and has the lgtm label, please assign mstemm for approval. For more information see the Kubernetes Code Review Process.

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• OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[FedeDP]

/milestone TBD

(@LucaGuerra feel free to change the milestone!)

[poiana]

Issues go stale after 90d of inactivity.

Mark the issue as fresh with /remove-lifecycle stale.

Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Provide feedback via https://github.com/falcosecurity/community.

/lifecycle stale

[leogr]

@cpanato @LucaGuerra
any news on this?

[cpanato]

i was in pto, returned today :) i will re-check this soon

[poiana]

Stale issues rot after 30d of inactivity.

Mark the issue as fresh with /remove-lifecycle rotten.

Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

Provide feedback via https://github.com/falcosecurity/community.

/lifecycle rotten