Use awscli from Alpine

Python2 is no longer in the Alpine repos. Skip pip and just
use the awscli from Alpine, which is on Python 3.

Dockerfile

@@ -2,15 +2,10 @@ FROM alpine:3
 
 RUN apk -v --update add \
         bash \
-        python \
-        py-pip \
-        groff \
-        less \
-        mailcap \
+        aws-cli  \
         jq \
         wget \
         && \
-    pip install --upgrade awscli==1.14.5 s3cmd==2.0.1 python-magic && \
     apk -v --purge del py-pip && \
     rm /var/cache/apk/*
 
@@ -22,4 +17,4 @@ RUN echo -e "*/10 * * * * /bin/bash update-dns.sh >> /var/log/cron.log 2>&1" > /
 RUN crontab /etc/cron.d/dns-cron
 RUN touch /var/log/cron.log
 
-CMD crond && tail -f /var/log/cron.log
+CMD crond && tail -f /var/log/cron.log