packages: Add an "optional" set

[ivy]

Summary

This is everything in "base" but without compilers. This means we
have sets to support four basic workloads:

• "minimal" for a small installation where the user intends to add other packages by hand.

• "optional" for a complete installation on a production system which does not need to compile software.

• "devel", which can be added to either minimal or optional when compilers are required.

• "base" for a complete installation, including compilers, for users who don't want to interact with pkgbase and just want the complete system installed like it was before.

This is probably the last set want to add; any further metapackages
would be better treated as "task" packages intended to target one
specific workload.

[ivy]

@dch: you should be able to use this for the "notoolchain" OCI image.

[cperciva]

release/packages/sets/optional-jail-dbg.ucl

19

Should this say "for jails"?

[ivy]

add a description for bsdinstall

[ivy]

fix the optional-jail-dbg comment

[ivy]

release/packages/sets/optional-jail-dbg.ucl

19

probably yes, fixed!

[cperciva]

LGTM!