Since I overhauled the way lintian runs on CI, we are struct with a lintian error related to jessie-wikimedia being a bad distribution. Previously we ran lintian on the build host which has a lintian configuration to accept those distributions names. The change I made yesterday is to run lintian inside the build environment and the configuration is thus missing.
All the magic to setup a lintian vendor profile has been made via https://gerrit.wikimedia.org/r/#/c/297765/
Namely we need in the build environment:
/etc/lintianrc
LINTIAN_PROFILE = wikimedia
Recursively copyor bind mount the directory tree at /usr/share/lintian/vendors/wikimedia.