Automatically update bundlesizeMax on publish

[achingbrain]

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

People frequently forget to update the bundlesizeMax parameter in .aegir.js, it'd be helpful if we could just do that automatically when publishing.

Describe the solution you'd like

The addition of a flag to aegir release* that updates bundlesizeMax.

Describe alternatives you've considered

Manual updating of this value is often forgotten.

Additional context

🤷