Add back CI repo

This time around with signature checking.  It got lost completely n
d1ff69ec.

root.sh

@@ -194,6 +194,10 @@ deb http://$mirror/debian $distro-updates main contrib non-free
 deb-src http://$mirror/debian $distro-updates main contrib non-free
 deb http://security.debian.org/debian-security $distro/updates main contrib non-free
 deb-src http://security.debian.org/debian-security $distro/updates main contrib non-free
+EOF
+
+    cat << EOF > "${basedir}/etc/apt/sources.list.d/ci.list"
+deb http://ci.puri.sm/ scratch librem5
 EOF
 
     cat << EOF > "${basedir}/etc/apt/apt.conf.d/71-no-recommends"