Missing mkfs.vfat when building Ubuntu Core 22 image

[Damian Zaręba]

I'm trying to build Ubuntu Core 22 ARM64 image on my openSUSE Tumbleweed desktop, but I'm unable to, because of missing mkfs.vfat.

Console output for command (ubuntu-image snap lafrite.model):
```
[0] make_temporary_directories
[1] determine_output_directory
[2] prepare_image
WARNING: proceeding to download snaps ignoring validations, this default will change in the future. For now use --validation=enforce for validations to be taken into account, pass instead --validation=ignore to preserve current behavior going forward
[3] load_gadget_yaml
[4] set_artifact_names
[5] populate_rootfs_contents
[6] generate_disk_info
[7] calculate_rootfs_size
[8] populate_bootfs_contents
[9] populate_prepare_partitions
Error: Error running mkfs with content: exec: "mkfs.vfat": executable file not found in $PATH
```

[Damian Zaręba (khazakar)]

Neverming, sorry!
Adding /usr/sbin and /sbin to PATH for user helped. Sorry again!