cd /tmp
curl -s https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.gpg
mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg
echo "deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main" \
    > /etc/apt/sources.list.d/vscode.list

apt-get update
apt-get install -y code # or code-insiders