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/tails#12002, 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/tails#5630. 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/tails#5630

Related issues

• Related to tails/tails#12829
• Related to tails/tails#12002
• Related to tails/sysadmin#13526