Drone

Expose pipeline name as Drone ENV var

Hey, we have a lot of monorepos in our environment, we use the tree-plugin with multiple drone.yml placed in each folder. It would be nice to have an ENV var like ${DRONE_PIPELINE_NAME}

the Pipeline name is passed to the environment as DRONE_STAGE_NAME
https://docs.drone.io/pipeline/environment/reference/drone-stage-name/