Sort out the apt-snapshots-disk partition situation on apt.lizard

Originally created by @bertagaz on #12725 (Redmine)

Due to the implementation of Vagrant builds in Jenkins being deployed before tails#12002 (closed), we could not grow this partition as much as planned/needed. On top of that, we had to freeze a bit more APT snapshots than usual for tails#5630 (closed). So our monitoring is rightfully complaining that the disk space left on the apt-snapshosts-disk partition of apt.lizard is critical.

Parent Task: tails#5630 (closed)

Related issues

Edited by bertagaz