feat(Docker): remove necessity of pdns repo key file

Dockerfile

@@ -8,14 +8,14 @@ RUN echo 'deb http://repo.powerdns.com/debian jessie-auth-40 main' \
  && echo 'Pin: origin repo.powerdns.com' \
       >> /etc/apt/preferences.d/pdns \
  && echo 'Pin-Priority: 600' \
-      >> /etc/apt/preferences.d/pdns \\
- && cat /root/FD380FBB-pub.asc | apt-key add - 
+      >> /etc/apt/preferences.d/pdns
 
-RUN apt-get update && apt-get install -y \
-    pdns-server \
-    pdns-backend-mysql \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
+RUN set -ex \
+	&& apt-key adv --keyserver hkp://pool.sks-keyservers.net --recv 0x1B0C6205FD380FBB \
+	&& apt-get update \
+	&& apt-get install -y pdns-server pdns-backend-mysql \
+	&& apt-get clean \
+	&& rm -rf /var/lib/apt/lists/*
 
 COPY ./pdns-mysql.conf /etc/powerdns/pdns.d/pdns.local.gmysql.conf
 COPY ./pdns.conf /etc/powerdns/pdns.conf

FD380FBB-pub.asc

@@ -1,30 +0,0 @@
------BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1
-
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-d5a03QgyYgMX0WW8Smam
-=BY4B
------END PGP PUBLIC KEY BLOCK-----