Use proper templating for dnsmasq conf

data/hooks/conf_regen/43-dnsmasq

@@ -27,14 +27,13 @@ do_pre_regen() {
   ipv6=$(curl -s -6 https://ip6.yunohost.org 2>/dev/null || true)
   ynh_validate_ip6 "$ipv6" || ipv6=''
 
+  export ipv4
+  export ipv6
+
   # add domain conf files
   for domain in $YNH_DOMAINS; do
-    cat domain.tpl \
-      | sed "s/{{ domain }}/${domain}/g" \
-      | sed "s/{{ ip }}/${ipv4}/g" \
-      > "${dnsmasq_dir}/${domain}"
-    [[ -n $ipv6 ]] \
-      && echo "address=/${domain}/${ipv6}" >> "${dnsmasq_dir}/${domain}"
+      export domain
+      ynh_render_template "domain.tpl" "${dnsmasq_dir}/${domain}"
   done
 
   # remove old domain conf files

data/templates/dnsmasq/domain.tpl

@@ -1,4 +1,7 @@
-address=/{{ domain }}/{{ ip }}
+address=/{{ domain }}/{{ ipv4 }}
+{% if ipv6 %}
+address=/{{ domain }}/{{ ipv6 }}
+{% endif %}
 txt-record={{ domain }},"v=spf1 mx a -all"
 mx-host={{ domain }},{{ domain }},5
 srv-host=_xmpp-client._tcp.{{ domain }},{{ domain }},5222,0,5