assert that not providing a DBSize doesn't overwrite the existing config
assert that not providing a DBSize doesn't overwrite the existing config

Signed-off-by: Daniel Jones <8578700484295988fe8fdd9bd566b21b12b0777c@engineerbetter.com>

EngineerBetter/concourse-up,EngineerBetter/concourse-up,EngineerBetter/concourse-up