```
Instead of using installworld to build the release media, use the
base package repository we already created. This is much faster
than running installworld again, and in future will allow us to
build install media from an external package repository.
For bootonly.iso and disc1.isoThe sets used for each medium are:
* disc1: kernels, optional. This provides a basic live system.
* bootonly: kernels, install set-kernels and set-optional.minimal. This saves about 100MB compared to
We could use minimal for bootonlyinstalling optional.
* dvd: kernels, optional, but people use this as recoverydevel. We might want to drop devel in
mediathe future to include more packages, but for now, in which case it's useful to have the extra packagesthis matches
the current contents of the medium.
For dvd1.isoSince the new install-system target always installs pkg, also install set-devel (the compiler toolchain) towe can also
matchsimplify the previous behaviourtarget-specific logic a bit to only handle the extra
packages.
Keep the existing non-package method for the NOPKGBASE case so that
downstream users can continue building distset install media without
having to depend on pkg. This should be removed once we vendor pkg.
Since the new install-system target always installs pkg, we can alsoAdd a warning about distset support being deprecated. This is only
simplify the target-specific logic a bit to only handle the extraprinted if NOPKGBASE is set and can be disabled entirely by setting
packages.RELEASE_SKIP_DISTSET_WARNING.
```