doc: forgot to install gnupg and removed sudo
@@ -43,7 +43,8 @@ docker run -it debian:buster
apt-get update
apt-get install ca-certificates
apt-get install vim
-sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F26BBE02F3C315A19BF1F791A9A25CC1CC83E839
+apt-get install gnupg
+apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F26BBE02F3C315A19BF1F791A9A25CC1CC83E839
vim /etc/apt/sources.list
```
