Trixies uses tmpfs for /tmp, so let's use /var/tmp/vm for temporary VM files

roles/lmn_vm/tasks/main.yml

@@ -126,6 +126,12 @@
     group: lmnsynci
     mode: 0755
 
+- name: Create cleanup-vm.conf
+  ansible.builtin.copy:
+    dest: /etc/tmpfiles.d/clean-vm.conf
+    content: |
+      R! /var/tmp/vm
+
 - name: Install squid
   apt:
     name: