Create POC using tekton-pipeline: evaluation matrix [part 2]

[kasiakepka]

Description

There is more and more demand for workflow like prowjobs. We see such requirements coming from developers and from kyma modularisation project. Prow has support for using a tekton pipeline as agent executing prowjob logic. However this feature is not documented. We need to research how difficult would be to setup tekton based prowjobs.

Tekton itself is a native k8s CI/CD tool. It has nice feature of Tasks catalog which stores Tasks definitions and makes easier reusing Tasks in multiple Pipelines.

Evaluation items
How Prow present results of tekton prowjobs?
How developers can access logs from execution?

Tasks

• Evaluate Tekton based on the evaluation guideline (see Define evaluation matrix and requirements for pipeline POCs #6222 )
  • Create test pipeline using tekton-pipelines agent
  • Fill out evaluation matrix

Acceptance Criteria

• Presubmit building image with image-builder, running unit tests, integration tests and linting.
• Postsubmit identifing latest build image, calling signing service and security scans.

Some resources:

Tekton documentation: https://tekton.dev/docs/getting-started/
Pipeline spec in prowjob: https://github.com/kubernetes/test-infra/blob/dfea60a61ae5d8b633d2ccf1f9b49dd87c48de16/prow/apis/prowjobs/v1/types.go#L194
Discussion about tekton agent and related documentation: kubernetes/test-infra#13874
Documentation proposal: https://github.com/kubernetes/test-infra/pull/13974/files