Use absolute path for save-logs output

test-driver

@@ -49,7 +49,7 @@ wait_for_vms() {
 }
 
 save_logs() {
-    local out_dir="$1"
+    local out_dir="$(realpath $1)"
 
     # Try to keep ansible-playbook output to a minimum so as not to
     # take too much space in the CI job logs.