storage: Allow formatting as swap in Anaconda mode

But there is no support for managing a entry for a new swap device in
fstab.

pkg/storaged/block/format-dialog.jsx

@@ -171,7 +171,7 @@ function format_dialog_internal(client, path, start, size, enable_dos_extended,
         title = cockpit.format(_("Format $0"), block_name(block));
 
     function is_filesystem(vals) {
-        return vals.type != "empty" && vals.type != "dos-extended" && vals.type != "biosboot";
+        return vals.type != "empty" && vals.type != "dos-extended" && vals.type != "biosboot" && vals.type != "swap";
     }
 
     function add_fsys(storaged_name, entry) {
@@ -187,6 +187,7 @@ function format_dialog_internal(client, path, start, size, enable_dos_extended,
     add_fsys("vfat", { value: "vfat", title: "VFAT" });
     add_fsys("ntfs", { value: "ntfs", title: "NTFS" });
     if (client.in_anaconda_mode()) {
+        add_fsys("swap", { value: "swap", title: "Swap" });
         if (block_ptable && block_ptable.Type == "gpt" && !client.anaconda.efi)
             add_fsys(true, { value: "biosboot", title: "BIOS boot partition" });
         if (block_ptable && client.anaconda.efi)
@@ -408,7 +409,7 @@ function format_dialog_internal(client, path, start, size, enable_dos_extended,
             if (trigger == "at_boot")
                 dlg.set_options("at_boot", { explanation: mount_explanation[vals.at_boot] });
             else if (trigger == "type") {
-                if (dlg.get_value("type") == "empty") {
+                if (dlg.get_value("type") == "empty" || dlg.get_value("type") == "swap") {
                     dlg.update_actions({ Variants: null, Title: _("Format") });
                 } else {
                     dlg.update_actions({ Variants: [action_variant], Title: action_title });