fix rpm script errors when $target is not exported
upgrade to latest centos 7, add trap_print.
#bug fix: add `slnd` dynamic linked sln.c
push to docker hub add docker config and META data
fix presence of /builds/<id>/projectdir/rootfs....../rpm
make ld.so.conf absolute towards rootfs/
fix ldconfig script, escape vars
add fake arch source and fake rpms to /usr/local/src update ldconfig / realldconfig
first working image, build as non root, for non root custom container image building.