Would be nice to support Ubuntu's RaspberryPi Image. Especially because this is an LTS Version of Ubuntu, which would fit nicely within the LTS versions of Zabbix.
I tried It with the raspian source file but, without success.
$ apt update
Hit:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
Hit:5 http://repo.zabbix.com/zabbix/5.0/raspbian buster InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
N: Skipping acquire of configured file 'main/binary-arm64/Packages' as repository 'http://repo.zabbix.com/zabbix/5.0/raspbian buster InRelease' doesn't support architecture 'arm64'