I found this post about apt-key
wget -O- https://forge.yunohost.org/yunohost.asc -q | apt-key add -qq - >/dev/null 2>&1
wget -O- https://archive.raspberrypi.org/debian/raspberrypi.gpg.key -q | apt-key add -qq - >/dev/null 2>&1
but no success so far.
when i use the whole line I get no output. And if i am using wget and apt-key seperately the apt-key is not continuing at all…