Add exim4 user to the letsencrypt group

src/freedombone-addcert

@@ -291,6 +291,7 @@ function add_cert_letsencrypt {
     chmod -R 600 /etc/letsencrypt
     chmod -R g=rX /etc/letsencrypt
     chown -R root:ssl-cert /etc/letsencrypt
+    addgroup Debian-exim ssl-cert
 
     nginx_ensite "${LETSENCRYPT_HOSTNAME}"
     systemctl start nginx