Force use of /lmn/media/USER share for legacy VMs

- Introduced VMLEGACY environment variable to ensure that old VMs
  utilize the legacy media share located at /lmn/media/USER.
- This change is aimed at maintaining compatibility with older
  virtual machines that rely on the previous media share structure.

roles/lmn_vm/files/vm-run

@@ -172,7 +172,8 @@ start_virtiofsd() {
   # start_virtiofs_service "default-school" "/srv/samba/schools/default-school" "Y"
 
   # Home@PC / VM-Data
-  if [[ "${HOME}" != "${NETHOME}" ]]; then
+  # if the environment variable VMLEGACY is set, /lmn/media/USER is forced
+  if [[ "${HOME}" != "${NETHOME}" && ! -v VMLEGACY ]]; then
     start_virtiofs_service "Home_Linux" "${HOME}" "Y"
   else
     start_virtiofs_service "VM-Data" "/lmn/media/${USER}" "Y"