mailu: gate scanner readiness on its native ping response

services/mailu/helmrelease.yaml

@@ -842,6 +842,16 @@ spec:
                   spec:
                     containers:
                       - name: clamav
+                        readinessProbe:
+                          exec:
+                            command:
+                              - /bin/bash
+                              - -ec
+                              - 'exec 3<>/dev/tcp/127.0.0.1/3310; printf "PING\n" >&3; read -r -t 3 reply <&3; test "$reply" = PONG'
+                          initialDelaySeconds: 10
+                          periodSeconds: 15
+                          timeoutSeconds: 5
+                          failureThreshold: 3
                         env:
                           - name: SECRET_KEY
                             $patch: delete

testing/tests/test_nextcloud_bootstrap.py

@@ -1,7 +1,6 @@
 """Check that a routine Nextcloud restart preserves installed app files."""
 
 from pathlib import Path
-import shlex
 import subprocess
 
 import yaml