Run 2 commands at once in parallel

[ojkelly]

Is your feature request related to a problem? Please describe.

I have a use case where two commands are used to upload, upload and upload:docker.

They depend on the output of a previous yarn build run.

Describe the solution you'd like
I want to be able to run these in in parallel with no regard for the dependency graph, such that the most files are being transferred as possible.

Describe alternatives you've considered
Running the commands in parallel via bash, but it has a challenge of mixed output.