ninja: set app key and cipher

basic/apps/ninja/invoiceninja-values-configmap.yaml

@@ -33,12 +33,15 @@ data:
         password: "${redis_password}"
 
     debug: true
+    appKey: "${app_key}"
     appURL: "https://ninja.${domain}"
     userEmail: "${admin_email}"
     userPassword: "${password}"
     mailer: "smtp" # FIXME use "${outgoing_mail_enabled}"
     # https://github.com/invoiceninja/invoiceninja/blob/v5-stable/config/mail.php#L36
     extraEnvVars:
+      - name: APP_CIPHER
+        value: AES-256-CBC
       - name: MAIL_MAILER
         value: smtp
       - name: MAIL_HOST