carousel: Support keynav

Fixes: GNOME/libhandy#146
11 jobs for carousel_keynav in 95 minutes and 22 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Build
passed api-visibility #744105

00:00:30

passed build-debian-clang #744107

00:04:46

passed build-debian-gcc #744106

00:50:40

passed build-fedora-gcc #744108

00:08:54

passed build-flatpak #744109
flatpak

00:01:27

passed build-flatpak-glade #744110
flatpak

00:04:11

 
  Test+Docs
passed build-gtkdoc #744111

00:35:45

passed unit-test #744112

00:35:04

41.2%
 
  Package
passed package-debian-buster #744113

00:03:47

 
  Test Package
passed autopkgtest-debian-buster-package #744114

00:05:08

passed lintian-debian-buster-package #744115

00:02:33