roles/bind: update base image and add libcap

roles/bind/templates/Dockerfile.j2

 {% if bind_base_tag is not defined %}
-FROM ubuntu:20.04 AS build-base
+FROM ubuntu:22.04 AS build-base
 
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get -y update && apt-get -y dist-upgrade
@@ -16,6 +16,7 @@ RUN apt-get -y install		\
 	libjemalloc-dev		\
 	libjson-c-dev		\
 	libnghttp2-dev		\
+	libcap-dev		\
 	libssl-dev		\
 	libtool			\
 	libtool-bin		\