fix #4588: ui: acme: allow setting the alias of DNS domains

Domains validated with the DNS challenge can have an alias, so that the
challenge record is created on another domain, which the
'_acme-challenge' record of the domain points to with a CNAME. This is
useful if the DNS plugin should not be able to update the zone of the
domain itself.

But the alias could only be set on the CLI, as the edit window only
kept an existing one in a hidden field. Show it as a text field for
domains with the DNS challenge type, like the plugin.

Signed-off-by: Michal Fox <me@dualfroz.com>

www/manager6/node/ACME.js

@@ -332,16 +332,14 @@ Ext.define('PVE.node.ACMEDomainEdit', {
                         change: function (cb, value) {
                             let me = this;
                             let view = me.up('pveACMEDomainEdit');
-                            let pluginField = view.down('field[name=plugin]');
+                            for (const name of ['plugin', 'alias']) {
-                            pluginField.setDisabled(value !== 'dns');
+                                let field = view.down(`field[name=${name}]`);
-                            pluginField.setHidden(value !== 'dns');
+                                field.setDisabled(value !== 'dns');
+                                field.setHidden(value !== 'dns');
+                            }
                         },
                     },
                 },
-                {
-                    xtype: 'hidden',
-                    name: 'alias',
-                },
                 {
                     xtype: 'pveACMEPluginSelector',
                     name: 'plugin',
@@ -357,6 +355,14 @@ Ext.define('PVE.node.ACMEDomainEdit', {
                     value: '',
                     fieldLabel: gettext('Domain'),
                 },
+                {
+                    xtype: 'proxmoxtextfield',
+                    name: 'alias',
+                    disabled: true,
+                    hidden: true,
+                    fieldLabel: gettext('Alias'),
+                    emptyText: Proxmox.Utils.noneText,
+                },
             ],
         },
     ],