S390x: no space left on device

We routinely get this error when using Docker on s390x:

Pulling ubuntu-cpp ... 

ERROR: for ubuntu-cpp  write /var/lib/docker/tmp/GetImageBlob681187112: no space left on device

write /var/lib/docker/tmp/GetImageBlob681187112: no space left on device

Error: `docker-compose --file /home/travis/build/apache/arrow/docker-compose.yml pull --ignore-pull-failures ubuntu-cpp` exited with a non-zero exit code 1, see the process log above.

https://travis-ci.org/github/apache/arrow/jobs/696790565#L203

Unfortunately it seems Travis has essentially abandoned support for non-x86. The issue you are seeing has been reported many times before and still isn’t resolved, e.g. No space left on device for System Z