Reduce docker layer

Dockerfile

@@ -1,10 +1,11 @@
 FROM alpine:3.6
 
-RUN apk add --update curl && \
-    rm -rf /var/cache/apk/*
-
 ADD cloudflare.sh /cloudflare.sh
-RUN chmod +x /cloudflare.sh
 ADD cron /var/spool/cron/crontabs/root
 
-CMD /cloudflare.sh && crond -f
+RUN apk add --update curl && \
+    rm -rf /var/cache/apk/* && \
+    chmod +x /cloudflare.sh
+
+CMD /cloudflare.sh && \
+    crond -f