Code review comment for lp:~paelzer/ubuntu-manpage-repository/ubuntu-manpage-repository-speed-boost

Trying to help with fixing and debugging the slow execution in prodstack.
On one hand this will run the releases concurrently allowing it to make more use of the CPUs now given to us.

On the other hand adding timing into to the log will allow comparisons of this vs execution on other platforms where it seems faster.

A full run of noble+mantic is running locally atm, I'll provide a log later.