Added shadowsocks-libev docker image based alpine

Signed-off-by: Teddysun <i@teddysun.com>

docker/shadowsocks-libev/alpine/Dockerfile

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+# Dockerfile for shadowsocks-libev based alpine
+# Copyright (C) 2018 Teddysun <i@teddysun.com>
+# Reference URL:
+# https://github.com/shadowsocks/shadowsocks-libev
+
+FROM alpine:latest
+LABEL maintainer="Teddysun <i@teddysun.com>"
+
+ENV LIBEV_VER 3.2.0
+ENV LIBEV_NAME shadowsocks-libev-${LIBEV_VER}
+ENV LIBEV_RELEASE https://github.com/shadowsocks/shadowsocks-libev/releases/download/v${LIBEV_VER}/${LIBEV_NAME}.tar.gz
+
+RUN set -ex \
+    && runDeps=' \
+       tar \
+       git \
+       wget \
+       build-base \
+       c-ares-dev \
+       autoconf \
+       automake \
+       libev-dev \
+       libtool \
+       libsodium-dev \
+       linux-headers \
+       mbedtls-dev \
+       pcre-dev \
+       ' \
+    && apk add --no-cache --virtual .build-deps \
+       ${runDeps} \
+    && mkdir -p /tmp/libev \
+    && cd /tmp/libev \
+    && git clone --depth=1 https://github.com/shadowsocks/simple-obfs.git . \
+    && git submodule update --init --recursive \
+    && ./autogen.sh \
+    && ./configure --prefix=/usr --disable-documentation \
+    && make install \
+    && rm -rf * \
+    && wget -qO ${LIBEV_NAME}.tar.gz ${LIBEV_RELEASE} \
+    && tar zxf ${LIBEV_NAME}.tar.gz \
+    && cd ${LIBEV_NAME} \
+    && ./configure --prefix=/usr --disable-documentation \
+    && make install \
+    && apk add --no-cache \
+       rng-tools \
+       $(scanelf --needed --nobanner /usr/bin/ss-* \
+      | awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
+      | xargs -r apk info --installed \
+      | sort -u) \
+    && apk del .build-deps \
+    && cd /tmp \
+    && rm -rf /tmp/libev \
+
+COPY ./config_sample.json /etc/shadowsocks-libev/config.json
+VOLUME /etc/shadowsocks-libev
+
+USER nobody
+
+CMD [ "ss-server", "-c", "/etc/shadowsocks-libev/config.json" ]

docker/shadowsocks-libev/alpine/config_sample.json

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+{
+    "server":"0.0.0.0",
+    "server_port":9000,
+    "password":"password0",
+    "timeout":300,
+    "method":"aes-256-gcm",
+    "fast_open":true,
+    "nameserver":"8.8.8.8",
+    "mode":"tcp_and_udp"
+}