update Dockerfile-No-Jdk

Dockerfile-No-Jdk

@@ -1,15 +1,20 @@
-FROM alpine
+# Stage 1: Build
+FROM openjdk:8-jdk-alpine AS builder
 
 ARG ARTHAS_VERSION="3.7.3"
 ARG MIRROR=false
-
 ENV MAVEN_HOST=https://repo1.maven.org/maven2 \
   MIRROR_MAVEN_HOST=https://maven.aliyun.com/repository/public
 
 # if use mirror change to aliyun mirror site
-RUN if $MIRROR; then MAVEN_HOST=${MIRROR_MAVEN_HOST} ; fi && \
+RUN if [ "$MIRROR" = "true" ]; then MAVEN_HOST=${MIRROR_MAVEN_HOST} ; fi && \
   # download & install arthas
   wget -qO /tmp/arthas.zip "${MAVEN_HOST}/com/taobao/arthas/arthas-packaging/${ARTHAS_VERSION}/arthas-packaging-${ARTHAS_VERSION}-bin.zip" && \
   mkdir -p /opt/arthas && \
   unzip /tmp/arthas.zip -d /opt/arthas && \
   rm /tmp/arthas.zip
+
+# Stage 2: Final
+FROM alpine
+
+COPY --from=builder /opt/arthas /opt/arthas