Vagrantfile: force running on one cpu
Vagrantfile: force running on one cpu

At least for me, a recent update made it default to two
cpu cores, which impacts the frequency of which we can
spawn programs due to locking in VirtualBox. To avoid that,
we set it statically to one core.

Signed-off-by: Tobias Olausson <e5abfa285347082f76013504c37f988d1046765a@pelagicore.com>

tobsan/softwarecontainer,frznlogic/softwarecontainer,frznlogic/softwarecontainer,Pelagicore/softwarecontainer,kursatkobya/softwarecontainer,thenor/softwarecontainer,frznlogic/softwarecontainer,DunderRoffe/softwarecontainer,Pelagicore/softwarecontainer,kursatkobya/softwarecontainer,frznlogic/softwarecontainer,Pelagicore/softwarecontainer,thenor/softwarecontainer,kursatkobya/softwarecontainer,kursatkobya/softwarecontainer,thenor/softwarecontainer,tobsan/softwarecontainer,thenor/softwarecontainer,DunderRoffe/softwarecontainer,Pelagicore/softwarecontainer,DunderRoffe/softwarecontainer,DunderRoffe/softwarecontainer,tobsan/softwarecontainer,tobsan/softwarecontainer