ullbeking

Only this: softy -> docker
 
 [1] Armbian config: https://github.com/armbian/config

I use Armbian (of course) with debian or ubuntu (lately I've been using ubuntu but debian also work). I followed this documentation : https://docs.docker.com/install/linux/docker-ce/ubuntu/ you just have to use the armhf repository (there's 5 tabs with different arch).
 
I never have tested kubernetes on Arm devices even though I really want to test k3s but time is a limited resource :(.
 
 

I use docker 24/7 for my home automation for at least 2 years (almost 3). First on a banana pi and since 3 months on a Orange Pi +2E (I switched for the 2Gb of RAM).
 
I have a dozen of small containers (many small home made python script, mqtt server, nzbget, home assistant, traefik, ...) running all the time and it works great.
 
I don't know what to say specifically as it's been working mostly good. The only caveat I have is that sometimes docker bridge network get stucked and I have to reboot to get it back but it happened 3 times over 2 years.

This video explains how to do it for a orange pi (he uses a different OPi board but the process is the same).
 
Option 1: USB charger -> usb cable [solder and insulation tape] jumper wire with dupont female at other end -> male pin header on board (makes the connection removable)
Option 2: USB charger -> usb cable [solder and insulation tape] jumper wire [solder] pin header [solder] board (not removable) like this and this
 
you'll need to make sure the jumper cable can carry the required amps and exposed areas are insulated.
 
I have no recommendations on the second part of your question though.