Jenkins puts lots of temporary data (that's not part of the actual state, but automatically created) into the jenkins_home volume, by uncompressing the war there.

This unnecessarily bloats up the jenkins_home volume (about 200MB!), which is very unpleasant when running many instances and for backups.

I see several options for solving that problem:

1. dont uncompress it at all
2. mount it via fuse-zip
3. uncompress to some tmpfs
4. uncompress to an extra volume (which can be easily disposed)