Add Sub::Name (probably already included).

Just to be sure, add libsub-name-perl to the list of packages to
install. Moose currently uses it, so it's probably already there, but
just in case.
2 jobs for build-images in 5 minutes and 16 seconds (queued for 9 seconds)
latest
Status Job ID Name Coverage
  Test
passed #768504413
build-buster-32

00:05:15

passed #768504410
build-buster-64

00:04:38