puiparts fails on jessie if package depends on perl

from: phpmyadmin-team/phpmyadmin!12 (comment 115835)

The docker-image contains has package perl-base in version 5.20.2-3+deb8u12 from jessie-security installed. phpmyadmin depends on perl which is only available in version 5.20.2-3+deb8u11 because jessie-security is not available in the sources.list (I think thats where the problem should be solved). The package perl itsels depends with a strict version on perl-base 5.20.2-3+deb8u11 – but this is already installed in …deb8u12 and therefore apt denies the installation of perl and then pma …

adding

--extra-repo="deb http://security.debian.org/debian-security jessie/updates main"

fixes the issue