swh-docker images not cleaned after the jenkins build

The (swh-mirror/run-test)[https://jenkins.softwareheritage.org/job/DFP/job/run-tests/] don't remove it's images after the run. They occupy a lot of disk space on thyssen after a couple of weeks

root@thyssen:~# docker image ls | grep -E "softwareheritage/(base|web)" | wc -l
220

softwareheritage/web                                                   20221229             7e7b196c1d8f   4 hours ago     372MB
softwareheritage/web                                                   20221229-040002      7e7b196c1d8f   4 hours ago     372MB
softwareheritage/web                                                   latest               7e7b196c1d8f   4 hours ago     372MB
softwareheritage/base                                                  20221229             92552160a507   4 hours ago     688MB
softwareheritage/base                                                  20221229-040002      92552160a507   4 hours ago     688MB
softwareheritage/base                                                  latest               92552160a507   4 hours ago     688MB
...
softwareheritage/web                                                   20221107-133821      c825eb538933   7 weeks ago     399MB
softwareheritage/base                                                  20221107-133821      8f7fdd60fd84   7 weeks ago     716MB
softwareheritage/web                                                   20221107-125451      0e8091e72c06   7 weeks ago     371MB
softwareheritage/base                                                  20221107-125451      7a183b429493   7 weeks ago     688MB

root@thyssen:~# df -h /
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/thyssen--vg-root  144G  128G  9.9G  93% /