vfb: allow to set the verbosity with a parameter

3 jobs for vfb-verbosity in 8 minutes and 7 seconds (queued for 56 seconds)
latest
Status Job ID Name Coverage
  Docker Image
passed #783182
debian-testing

00:00:51

 
  Build And Test
passed #783183
autotools-build-and-test

00:07:16

passed #783184
meson-build-and-test

00:01:31