As a user, I have a custom pipeline build step that returns the result of the build step

As a user, I have a custom pipeline build step that returns the result of the build step.

Due to Jenkins limitation it is currently not possible to inject environment variables into the pipeline projects. One possible workaround would be to have a custom pipeline step (using the "Pipeline: Step API Plugin") that would return a Map with the several results of the operation (these results should be the same as the environment variables).