Story (Required)

As a non-admin Chains user trying to get signature I want to run "tkn/opc chain" command.

Background (Required)

Currently "tkn/opc chain" command requires admin privileges because it reads config map chains-config in namespace openshift-pipelines. If user specified the required data explicitly, the command would not have to read the config map and would return required data.

$ tkn chain signature --chains-namespace openshift-pipelines kaniko-chains-run-mpjcw > sig2
Error: failed to retrieve the backend storage: failed to retrieve the backend storage: error retrieving tekton chains configmap: configmaps "chains-config" is forbidden: User "user" cannot get resource "configmaps" in API group "" in the namespace "openshift-pipelines"

Approach (Required)

CLI flags for any data that is required by "tkn chain payload" and "tkn chain signature"

Acceptance Criteria (Mandatory)

Non-admin user can use tkn chain subcommands

Done Checklist

• Code is completed, reviewed, documented and checked in
• Unit and integration test automation have been delivered and running cleanly in continuous integration/staging/canary environment
• Continuous Delivery pipeline(s) is able to proceed with new code included
• Customer facing documentation, API docs etc. are produced/updated, reviewed and published
• Acceptance criteria are met