chart-unifi_network_application: attempt to fix init script

charts/unifi-network-application/templates/configmap.yaml

@@ -5,6 +5,8 @@ metadata:
   name: {{ include "template.fullname" . }}-mongodb-init-sh
 data:
   init-mongo.sh: |
+    #!/bin/bash
+
     if which mongosh > /dev/null 2>&1; then
       mongo_init_bin='mongosh'
     else