added raspbian repo

pdns/Dockerfile

@@ -6,7 +6,8 @@ RUN apt-get update && \
     apt-get install -y curl && \
     apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN echo 'deb http://repo.powerdns.com/debian jessie-auth-40 main' > /etc/apt/sources.list.d/pdns.list && \
+RUN dist=$(if uname -m | grep -iq arm  ; then echo raspbian; else echo debian; fi) &&\
+     echo "deb http://repo.powerdns.com/${dist} jessie-auth-40 main" > /etc/apt/sources.list.d/pdns.list && \
     echo 'Package: pdns-*\nPin: origin repo.powerdns.com\nPin-Priority: 600' > /etc/apt/preferences.d/pdns && \
     curl https://repo.powerdns.com/FD380FBB-pub.asc | apt-key add -