For example the samples module sets a new default uri but only if this is a public instance. Since the bootstrap files of the webapp are bootstrapped at last the /server/admin property will still be set to true at the moment sample install tasks are executed.

To steer that I introduce a optional property magnolia.bootstrap.authorInstance which is used by the core module to set /server/admin accordingly.

In addition I also introduce magnolia.bootstrap.samples which can be used to determine if sample content (in modules like forum) should get installed

In future versions the installation UI will ask for this kind of information.