Move VM prebuild as last thing

This allows tests to run faster so build will fail faster if it
fails
8 jobs for nanonyme/delay-prebuild-vm in 20 minutes and 22 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Flatpak
canceled #190858253
aarch64
app_aarch64

canceled #190858254
armhf
app_arm

00:20:22

canceled #190858252
x86_64 cache_i686
app_i686

canceled #190858251
x86_64 cache_x86_64
app_x86_64

 
  Vm
canceled #190858257
aarch64 allowed to fail manual
minimal_systemd_vm_aarch64

canceled #190858258
armhf
minimal_systemd_vm_arm

canceled #190858256
x86_64 cache_i686
minimal_systemd_vm_i686

canceled #190858255
x86_64 cache_x86_64
minimal_systemd_vm_x86_64