Add option to deploy only on successful CI events

[sedan07]

Currently the webhook seems to handle either push or pipeline/workflow run events and it already captures the status of the workflow run. But it doesn't seem to use this value as far as I can see. So currently if your puppet-control repo has a test workflow in GitHub then the webhook will get triggered 3 times (requested, in_progress and completed). But ideally it would ignore the first two and only deploy the environment/module if the workflow succeeds. Thus ensuring only environments/modules passing CI would get deployed.