Add security design requirements to Tekton

[afrittoli]

Add security to the list of Tekton design principles with details on specific requirements and links to OpenSSF reccomendations.

Signed-off-by: Andrea Frittoli [email protected]

[afrittoli]

@tektoncd/governing-board FYI

This is part of the work to meet the OpenSSF requirements.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop, vdemeester

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[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop, vdemeester

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ~~OWNERS~~ [vdemeester]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[jerop]

/lgtm

thank you @afrittoli!