gitlab-runner exec for all jobs in CI pipeline

Description

Right now gitlab-runner exec takes the name of a single job in .gitlab-ci and runs it. I would like to test the CI pipeline for my project which is complex and involves some jobs in parallel and some in series. I would like to be able to locally test my entire pipeline without having to manually enter the name of each job.

Proposal

Some flag like

gitlab-runner exec docker --all

to run the entire CI pipeline.