How to define user defined variables?

Drone Support
1

I want to use user defined variables to reduce duplications.

for example

command:
    - docker build --tag nexus.bs.us/app
    - docker push nexus.bs.us.app

to

command:
    - docker build --tag ${NEXUS}.bs.us/app
    - docker push ${NEXUS}.bs.us.app

How to define user defined variables?

2

https://docs.drone.io/pipeline/environment/syntax/