Zammad: configure Elasticsearch before zammad start (#12308)

* fix(zammad): configure Elasticsearch for LXC container startup

- Set discovery.type: single-node (required for single-node ES)
- Set xpack.security.enabled: false (not needed in local LXC)
- Set bootstrap.memory_lock: false (fails in unprivileged LXC)
- Add startup wait loop (up to 60s) to ensure ES is ready before
  Zammad installation continues

Fixes #12301-related recurring Elasticsearch startup failures

* Update install/zammad-install.sh

Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

---------

Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

install/zammad-install.sh

@@ -28,12 +28,23 @@ setup_deb822_repo \
   "stable" \
   "main"
 $STD apt install -y elasticsearch
-sed -i 's/^-Xms.*/-Xms2g/' /etc/elasticsearch/jvm.options
+sed -i 's/^#\{0,2\} *-Xms[0-9]*g.*/-Xms2g/' /etc/elasticsearch/jvm.options
-sed -i 's/^-Xmx.*/-Xmx2g/' /etc/elasticsearch/jvm.options
+sed -i 's/^#\{0,2\} *-Xmx[0-9]*g.*/-Xmx2g/' /etc/elasticsearch/jvm.options
+cat <<EOF >>/etc/elasticsearch/elasticsearch.yml
+discovery.type: single-node
+xpack.security.enabled: false
+bootstrap.memory_lock: false
+EOF
 $STD /usr/share/elasticsearch/bin/elasticsearch-plugin install ingest-attachment -b
 systemctl daemon-reload
 systemctl enable -q elasticsearch
 systemctl restart -q elasticsearch
+for i in $(seq 1 30); do
+  if curl -s http://localhost:9200 >/dev/null 2>&1; then
+    break
+  fi
+  sleep 2
+done
 msg_ok "Setup Elasticsearch"
 
 msg_info "Installing Zammad"