Skip building buildstep if SKIP_BUILD_STACK set. Useful for building dokku inside docker. #929
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When building dokku inside docker itself, the 'stack' step fails because of unaccessible /var/run/docker.sock, which cannot be bound via Dockerfile.
Thus, the only option is to skip that step and instead pull 'progium/buildstep' directly from docker Hub.
Something like 'ENV SKIP_BUILD_STACK=YES' in Dockerfile is assumed.