Snapshots being unexpectedly deleted

[richardcase]

What happened:
When removing the containerd lease for a specific microvm (e.g. reignite/ns1/mvm0) to remove the snapshots etc for a specific microvm it is also removing the snapshots for other microvms:

What did you expect to happen:
I would expect it to only remove the snapshots for the microvm the lease is for (i.e. mvm0) and not other microvms (i.e. mvm1 in this example).

How to reproduce it:

1. Create multiple microvms using reignite on the same host
2. Run something like ctr -n reignite leases rm reignite/ns1/mvm0

Environment:

• reignite version:
• OS (e.g. from /etc/os-release):

[richardcase]

This was being caused by not creating the snapshots with a lease and so the garbage collector when it ran would delete the snapshots.