Add dnspython for certbot

Fixes #168

Author: mblaschke

docker/certbot/latest/Dockerfile

@@ -14,5 +14,12 @@ VOLUME /etc/letsencrypt
 VOLUME /var/www
 
 RUN /usr/local/bin/apk-install \
+        python \
+        py-crypto \
+        py2-pip \
+        py2-dnspython \
         certbot \
-    && pip install pyRFC3339 configobj ConfigArgParse
+    && pip install --upgrade pip \
+    && hash -r \
+    && pip install pyRFC3339 configobj ConfigArgParse \
+    && /usr/local/bin/docker-image-cleanup

template/Dockerfile/images/certbot.jinja2

@@ -1,3 +1,4 @@
+{% import 'Dockerfile/docker.jinja2' as docker %}
 {% import 'Dockerfile/provision.jinja2' as provision %}
 
 {% macro env() -%}
@@ -7,6 +8,13 @@ ENV CERTBOT_DOMAIN  ""
 
 {% macro alpine() -%}
 RUN /usr/local/bin/apk-install \
+        python \
+        py-crypto \
+        py2-pip \
+        py2-dnspython \
         certbot \
-    && pip install pyRFC3339 configobj ConfigArgParse
+    && pip install --upgrade pip \
+    && hash -r \
+    && pip install pyRFC3339 configobj ConfigArgParse \
+    {{ docker.cleanup() }}
 {%- endmacro %}