Add and use filesystem tools

Overview

You need to add the tools that will let you format/create one or more additional volumes/filesystems of your choice.

F2FS

A new flash file system for Linux; recommended for any flash (SD card, USB, etc)

Install filesystem tools
```
apk add f2fs-tools
```
Create filesystem (sample session)
```
mkfs.f2fs /dev/sda3
```

Ext2/Ext4

A venerable Linux filesystem. Well supported (on non-UEFI x86/x86-64 systems one can boot from ext4 if one uses extlinux or grub2 instead of syslinux)

Install package
```
apk add e2fsprogs
```

Create filesystem (sample session)

mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/sda3

VFAT/FAT32/FAT16

The old standby from MS-DOS days and still used (as FAT32/ESP) for UEFI that is also used by many ARM bootloaders, including the one on the Raspberry Pi.