Merge remote-tracking branch 'origin/3.5.0-dev' into 3.5.0-dev

Dockerfile

-FROM maven:3-jdk-8-alpine
-LABEL maintainer="Tomaer Ma<i@tomaer.com>"
+FROM maven:3-jdk-8-alpine as MVN_BUILD
 
-WORKDIR /opt/solo
+WORKDIR /opt/solo/
 ADD . /tmp
+RUN cd /tmp && mvn package -DskipTests -Pci && mv target/solo/* /opt/solo/ \
+    && cp -f /tmp/src/main/resources/docker/* /opt/solo/WEB-INF/classes/
 
-ENV TZ=Asia/Shanghai
-RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone \
-    && cd /tmp && mvn package -DskipTests -Pci && mv target/solo/* /opt/solo/ \
-    && cp -f /tmp/src/main/resources/docker/* /opt/solo/WEB-INF/classes/ \
-    && rm -rf /tmp/* && rm -rf ~/.m2
+FROM openjdk:8-alpine
+LABEL maintainer="Liang Ding<d@b3log.org>"
+
+WORKDIR /opt/solo/
+COPY --from=MVN_BUILD /opt/solo/ /opt/solo/
+RUN apk add --no-cache ca-certificates tzdata
 
+ENV TZ=Asia/Shanghai
 EXPOSE 8080
 
 ENTRYPOINT [ "java", "-cp", "WEB-INF/lib/*:WEB-INF/classes", "org.b3log.solo.Starter" ]