min-copy-clocure test: ensure sshd up before starting

this test goes wrong intermittently in CI, see if this makes it more
reliable

tests/min-copy-closure/wait-until-ready.expect

@@ -1,13 +1,20 @@
 set timeout 60
 
 spawn socat unix-connect:vm/console -
-send "\r\n"
 expect {
-       "# " { send "hostname\r\n" };
+       "s6-linux-init"  { }
+       timeout { exit 1 }
 }
-
+set timeout 30
 expect {
-    "(none)" {}
-    "liminix" {}
-    timeout { exit(1) }
-}
+       "#" { send "PS1=\$(echo 'I1JFQURZIyA=' | base64 -d); stty -echo\n" }
+       timeout { exit 1 }
+}
+expect {
+       "#READY#" { send "s6-svwait -t 10000 -u /run/service/sshd; echo continue\n" }
+       timeout { exit 1 }
+}       
+expect {
+       "#READY#" { }
+       timeout { exit 1 }
+}