Support for sending message/notification from inside of a Pipeline

[keskad]

CI/CD Pipelines as a part of continuous integration process are used for testing the software. Testing frameworks like PHPUnit, PyTest or jUnit supports reporting.

Kubernetes-native solutions like Tekton or Argo Workflows does not have a presentation layer that could easily show a nice report of executed tests, therefore I come with a following proposal.

• API) Pipelines Feedback Controller can expose a HTTP API allowing to send a notification message to destination PR/MR/commit/slack/other during the Pipeline execution.

• Authentication) The controller could generate a temporary API token after receiving Pipeline starting signal and keep that token in a store (e.g. redis)

• Credentials) Mutation Webhooks could be used to inject temporary token by a controller into the TaskRun's environment variable

• jUnit implementation) Example implementation could be created in a separate repository - a CLI tool written in Go that would parse junit/xunit formatted report and contact Pipelines Feedback controller via API to send the notification