$> mettleci workbench set-branch \
    -url https://my-engine.my-org.com:8080 \
    -username workbench-user \ 
    -password workbench-password \
    -project MyProject \
    -branch develop

MettleCI Command Line (build 128)
(C) 2018-2022 Data Migrators Pty Ltd
workbench set-branch (v1.0-2)
Reading project list from 'https://my-engine.my-org.com:8080'
Found project 'MyProject' with id 2, updating branch to 'develop'
Done.