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 Name Job ID Coverage
  Docker Image
passed debian-testing #783182

00:00:51

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

00:07:16

passed meson-build-and-test #783184

00:01:31