Automatically bring up Build VM in staging playbook
Automatically bring up Build VM in staging playbook

Since the Build VM is a hard requirement, we might as well be friendly
to the developer and automatically bring it up as part of the staging
run.

conorsch/securedrop,ageis/securedrop,heartsucker/securedrop,conorsch/securedrop,garrettr/securedrop,conorsch/securedrop,micahflee/securedrop,ageis/securedrop,micahflee/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,heartsucker/securedrop,garrettr/securedrop,ageis/securedrop,garrettr/securedrop,ehartsuyker/securedrop,micahflee/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ageis/securedrop,garrettr/securedrop,micahflee/securedrop,conorsch/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop