Fails to install (Neptune 4 Plus) due to no pubkey available.

[makeitworktech]

Here's what happens when I try to install. Very new at this - help please?

Ahoi!
moonraker-timelapse install routine

        This will take some time ...
        You'll be prompted for sudo password if needed!

#################### WARNING #####################
Make sure you are not printing during install!
All related services will be stopped!
##################################################

Would you like to proceed? [Y/n]: Y
Check for dependencies to use moonraker-timelapse ...
Dependency 'moonraker' found ... [OK]
Dependency 'klipper' found ... [OK]
Installing core dependencies: 'wget' ...
Hit:1 http://deb.debian.org/debian buster InRelease
Get:2 http://security.debian.org buster/updates InRelease [34.8 kB]
Hit:3 http://deb.debian.org/debian buster-updates InRelease
Get:5 http://deb.debian.org/debian-security buster/updates InRelease [34.8 kB]
Get:6 https://github.armbian.com/configng stable InRelease [3,255 B]
Hit:4 http://armbian.chi.auroradev.org/apt buster InRelease
Err:6 https://github.armbian.com/configng stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 93D6889F9F0E78D5
Reading package lists... Done
W: GPG error: https://github.armbian.com/configng stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 93D6889F9F0E78D5
E: The repository 'https://github.armbian.com/configng stable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
make: *** [Makefile:20: install] Error 100

[makeitworktech]

Got it to work, had to run the following:

sudo wget https://apt.armbian.com/armbian.key -O key
sudo gpg --dearmor < key | sudo tee /usr/share/keyrings/armbian.gpg > /dev/null
sudo chmod go+r /usr/share/keyrings/armbian.gpg
sudo echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/armbian.gpg] http://apt.armbian.com $(lsb_release -cs) main  $(lsb_release -cs)-utils  $(lsb_release -cs)-desktop" | sudo tee /etc/apt/sources.list.d/armbian.list
apt update