Fix swap creation issue

[olexiyb]

wrap swap creation with transactional-update --continue shell to fix the issue of missing swap after node reboot fix for #1399

I see the proper transaction with 4Gb used for swap

# snapper list
 # │ Type   │ Pre # │ Date                     │ User │ Used Space │ Cleanup │ Description           │ Userdata
───┼────────┼───────┼──────────────────────────┼──────┼────────────┼─────────┼───────────────────────┼─────────
0  │ single │       │                          │ root │            │         │ current               │
1  │ single │       │ Sat Jun 29 19:42:50 2024 │ root │  80.40 MiB │         │ first root filesystem │
2  │ single │       │ Tue Jul  2 06:03:26 2024 │ root │  14.76 MiB │ number  │ Snapshot Update of #1 │
3- │ single │       │ Tue Jul  2 06:04:01 2024 │ root │ 352.00 KiB │ number  │ Snapshot Update of #2 │
4+ │ single │       │ Tue Jul  9 07:04:59 2024 │ root │   4.00 GiB │ number  │ Snapshot Update of #3 │

More info about swap creation in micros

Creating_a_btrfs_swapfile and openSUSE:Snapper_Tutorial#Swapfile

Due to issue we need to somehow run swapon -a after reboot
to solve

swapon: /var/lib/swap/swapfile: swapon failed: Read-only file system

I use systemd script

[mysticaltech]

@olexiyb Looking good, just one tiny change, and please also confirm that this is well tested and the swap on activation service works.

[mysticaltech]

Awesome! Thanks @olexiyb