Add files for a specific stage and service

[christian-kreuzberger-dtx]

Right now it is only possible to add files for pre-defined services and stages, e.g.:

        keptn.keptnInit project:"${project}", service:"${service}", stage:"dev", monitoring: "dynatrace", shipyard: ".keptn/shipyard.yaml"
        keptn.keptnAddResources('.keptn/dynatrace/sli.yaml','dynatrace/sli.yaml')
        keptn.keptnAddResources('.keptn/slo.yaml','slo.yaml')

would only add files to the specified stage dev.

However, in certain cases it makes sense to also allow adding files to other stages. Right now this would require calling keptnInit again, which is quite a heavy function (e.g., check if project exists, check if stage exists, check if service exists, ...).

It would be easier for the end-user to allow specifying a stage (and service) where files should be added to, e.g.:

        keptn.keptnAddResources('.keptn/slo.yaml','slo.yaml', stage: 'hardening', service: 'foobar-service')

Definition of Done

• addResource function available for adding files to a specifc stage and service
• Documentation/Example usage of this function is provided in README