Cherry on top of hack release

The first commit fixes a bug that affects all machines running Docker-in-Docker with systemd (that is, my machine, essentially).

The second one gets rid of some (IMHO) unnecessary display (`pushd` and `popd` output; and runs `go test -i` before the real tests), but echoes some help if you run the container without any argument.

The last one fixes a bug in Bash array syntax, and changes the order of build of the bundles for great success.