Add changes I've made manually on the build server

This also adds the xmr-stak cypto miner container image I created
That one is the first of potentially many images I won't push to the official Docker Hub registries, but insted to my own private registry

siverten/bind9/Dockerfile

@@ -1,6 +1,5 @@
-FROM alpine:3.12
-
-RUN apk --update --no-cache add bind bind-dnssec-tools
+FROM alpine:latest
+RUN apk update && apk upgrade
+RUN apk --no-cache add bind bind-dnssec-tools
 EXPOSE 53
-
 CMD ["named", "-c", "/etc/bind/named.conf", "-g", "-u", "named"]