This is a system install of Alpine linux for Raspberry Pi 2B, 3B, 3B+ and 4 image ready to burn to an SD card via balenaEtcher (there's no need to gunzip image).

If you prefer the command line, you can use dd and gzip:

gzip -dc /path/to/your/image.gz | sudo dd bs=4M of=/dev/sdX

The image automatically setup and configures:

• root user [pwd: raspberry]
• pi user [pwd: raspberry]
• ethernet
• wifi (edit wpa_supplicant.conf in the boot partition, on first boot it will be copied)
• bluetooth
• avahi
• swap
• openssh server
• root partition auto-expand on first boot
• docker
• portainer

I wanted a board where all the software on it is containerized and easy to restore.

Also, with Portainer, I can keep the entire system under control with a web GUI.