If rebuild time is a huge concern to you I would strongly recommend running a dedicated data container
That way you can bootstrap while your existing site is up and running, meaning you only deal with a few seconds of outage when upgrading via launcher
Bundle install is usually very fast when we just ship an image, I plan on having more regular updates to help out here
Assets precompile is the slowest part, we are cosidering pre-bundling assets or possibly adding a caching server or even more aggressive image updates, but nothing is a trivially easy solution