Added Trojan Docker Image

docker/trojan/Dockerfile

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+# Dockerfile for trojan based alpine
+# Copyright (C) 2020 Teddysun <i@teddysun.com>
+# Reference URL:
+# https://github.com/trojan-gfw/trojan
+# https://trojan-gfw.github.io/trojan/
+
+FROM alpine:latest AS builder
+WORKDIR /root
+RUN set -ex \
+	&& VERSION="v1.14.1" \
+	&& apk add --no-cache git build-base make cmake boost-dev openssl-dev mariadb-connector-c-dev \
+	&& git clone --branch ${VERSION} --single-branch https://github.com/trojan-gfw/trojan.git \
+	&& cd trojan \
+	&& cmake . \
+	&& make \
+	&& strip -s trojan
+
+FROM alpine:latest
+LABEL maintainer="Teddysun <i@teddysun.com>"
+
+RUN set -ex \
+	&& apk add --no-cache tzdata ca-certificates libstdc++ boost-system boost-program_options mariadb-connector-c
+
+COPY --from=builder /root/trojan/trojan /usr/bin
+COPY config.json /etc/trojan/config.json
+VOLUME /etc/trojan
+ENV TZ=Asia/Shanghai
+CMD [ "trojan", "-c", "/etc/trojan/config.json" ]