tests: Init libhandy

This ensures we run the test the same way applications are expected to
run libhandy.
4 jobs from master in 5 minutes and 8 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #7331
librem5
build-debian-clang

00:02:01

passed #7330
librem5
build-debian-gcc

00:02:27

37.2%
passed #7333
librem5
build-debian-package

00:01:34

passed #7332
librem5
build-fedora-gcc

00:03:05