降级jdk8，支持 armv6 armv7

Dockerfile

@@ -1,10 +1,10 @@
-FROM maven:3.6.3-jdk-11 AS maven
+FROM maven:3-jdk-8-alpine AS maven
 USER root
 COPY ./ /tmp/code
 RUN cd /tmp/code && mvn clean package -Dmaven.test.skip=true -Dmaven.javadoc.skip=true
 
 
-FROM openjdk:11-jdk-oracle
+FROM openjdk:8-jdk-alpine
 COPY --from=maven /tmp/code/target/*.jar /webdav.jar
 EXPOSE 8080
 ENV JAVA_OPTS="-Xmx1g"