Update dependencies in Dockerfile (#732)

docker/alpine/Dockerfile

@@ -5,14 +5,13 @@
 FROM alpine
 MAINTAINER kev <noreply@datageek.info>
 
-ENV SS_VER 2.4.6
-ENV SS_URL https://github.com/shadowsocks/shadowsocks-libev/archive/v$SS_VER.tar.gz
-ENV SS_DIR shadowsocks-libev-$SS_VER
-ENV SS_DEP autoconf build-base curl libtool linux-headers openssl-dev
+ENV SS_URL https://github.com/shadowsocks/shadowsocks-libev.git
+ENV SS_DIR shadowsocks-libev
+ENV SS_DEP git autoconf build-base curl libtool linux-headers openssl-dev asciidoc xmlto
 
 RUN set -ex \
     && apk add --update $SS_DEP \
-    && curl -sSL $SS_URL | tar xz \
+    && git clone $SS_URL \
     && cd $SS_DIR \
         && ./configure \
         && make install \
@@ -27,6 +26,7 @@ ENV PASSWORD=
 ENV METHOD      aes-256-cfb
 ENV TIMEOUT     300
 ENV DNS_ADDR    8.8.8.8
+ENV DNS_ADDR_2  8.8.4.4
 
 EXPOSE $SERVER_PORT
 EXPOSE $SERVER_PORT/udp
@@ -38,4 +38,5 @@ CMD ss-server -s $SERVER_ADDR \
               -t $TIMEOUT \
               --fast-open \
               -d $DNS_ADDR \
+              -d $DNS_ADDR_2 \
               -u

docker/ubuntu/Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:latest
 
 MAINTAINER Sah Lee <contact@leesah.name>
 
-ENV DEPENDENCIES git-core build-essential autoconf libtool libssl-dev
+ENV DEPENDENCIES git-core build-essential autoconf libtool libssl-dev asciidoc xmlto
 ENV BASEDIR /tmp/shadowsocks-libev
 ENV SERVER_PORT 8338