list packages are built
usage: fx list-packages [--base|--cache|--universe] [--verbose] [pattern]
list-packages lists the packages that the build is aware of. These are
packages that can be rebuilt, and/or pushed to a device.
If a pattern is supplied, only packages matching the pattern are listed.
Note: list-packages DOES NOT list all packages that could be built, only
those which are included in the current build configuration.
--base - list only packages in base
--cache - list only packages in cache
--universe - list all packages
--verbose - print package set for each listed package
See https://fuchsia.dev/fuchsia-src/development/build/boards_and_products
for more information about using these package sets.