adding support for ubuntu 22.04 and /etc/apt/trusted.gpg.d

[carefreepineapple]

https://github.com/nodesource/distributions/issues/1780

It appears as a result of the update to Ubuntu 22.04 where they transitioned from using /etc/apt/trusted.gpg to using individual .gpg files located in /etc/apt/trusted.gpg.d, apt will no longer read gpg keys from outside of /etc/apt/trusted.gpg.d

[riosje]

I don't see why this change is necessary, it is working properly on ubuntu 22.04

```SHELL
docker run -it ubuntu:22.04 bash

apt-get update -y && apt-get install curl -y
curl -fsSL https://deb.nodesource.com/setup_20.x | bash -
apt-get install -y nodejs

[riosje]

Hi @didousoft @carefreepineapple would like to elaborate on why is this change necessary?

[didousoft]

I accidently reviewed the pull request. Please ignore my review