Added shadowsocks-r docker image based alpine

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

docker/shadowsocks-r/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 python:3.6-alpine
+LABEL maintainer="Teddysun <i@teddysun.com>"
+
+RUN runDeps="\
+		tar \
+		wget \
+		libsodium-dev \
+		openssl \
+	"; \
+	set -ex \
+	&& apk add --no-cache --virtual .build-deps ${runDeps} \
+	&& wget -O /tmp/shadowsocksr-3.2.2.tar.gz https://github.com/shadowsocksrr/shadowsocksr/archive/3.2.2.tar.gz \
+	&& tar zxf /tmp/shadowsocksr-3.2.2.tar.gz -C /tmp \
+	&& mv /tmp/shadowsocksr-3.2.2/shadowsocks /usr/local/ \
+	&& rm -fr /tmp/shadowsocksr-3.2.2 \
+	&& rm -f /tmp/shadowsocksr-3.2.2.tar.gz
+
+COPY ./config_sample.json /etc/shadowsocks-r/config.json
+VOLUME /etc/shadowsocks-r
+
+USER nobody
+
+CMD [ "/usr/local/shadowsocks/server.py", "-c", "/etc/shadowsocks-r/config.json" ]

docker/shadowsocks-r/alpine/config_sample.json

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+{
+    "server":"0.0.0.0",
+    "server_ipv6":"::",
+    "server_port":9000,
+    "local_address":"127.0.0.1",
+    "local_port":1080,
+    "password":"password0",
+    "timeout":120,
+    "method":"aes-256-cfb",
+    "protocol":"origin",
+    "protocol_param":"",
+    "obfs":"plain",
+    "obfs_param":"",
+    "redirect":"",
+    "dns_ipv6":false,
+    "fast_open":true,
+    "workers":1
+}