When using Jenkins X we have build packs with Jenkisnfiles using `agent` labels for pod templates and kubernetes plugins like this:

e.g. our build packs use Jenkinsfiles like this:

https://github.com/jenkins-x/draft-packs/blob/2.1/packs/maven/Jenkinsfile#L2 vs

with 

agent {   
  label "jenkins-maven"    
} 

for serverless jenkins we had to create a branch in the build pack like this:

https://github.com/jenkins-x/draft-packs/blob/prow/packs/maven/Jenkinsfile#L2

using 

    agent any 

It would be awesome to have a CLI argument or environment variable that basically ignores the `agent` setting! Then we won't need to have a separate set of build packs for serverless