CI: Revert to ens3 interface for Leafcloud

Leafcloud is not using the q35 machine type yet.

Author: markgoddard

.github/workflows/stackhpc-all-in-one.yml

@@ -34,7 +34,7 @@ on:
       vm_interface:
         description: Default network interface name
         type: string
-        default: enp3s0
+        default: ens3
       vm_flavor:
         description: Flavor for the all-in-one VM
         type: string
@@ -318,4 +318,4 @@ jobs:
       - name: Prune Docker images over 1 week old
         # May fail if another prune is running
         run: docker image prune --all --force --filter until=168h || true
-        if: always()
+        if: always()