start logging always at 0.
attention: this does not work for parallel builds? need a logger per build job?
build debian packages from the dsc file. no need for debian build script anymore.
download sources with wget in the host, no need for wget in the container.
CentOS: do not clean the yum cache, to avoid downloading the packages again
use download images again.
there was an error for debian image, x86_64 vs amd64 or something like that