[feat] use openjdk for docker images

docker/Dockerfile

@@ -8,7 +8,7 @@ RUN git clone --depth 1 https://github.com/xel-software/xel-lite-wallet /code
 #
 # Maven build
 #
-FROM maven:3.6.3-adoptopenjdk-11 as build
+FROM maven:3.6.3-openjdk-11 as build
 
 COPY --from=sources /code/ /build/
 
@@ -17,15 +17,16 @@ RUN cd /build && mvn package
 #
 # Final image
 #
-FROM adoptopenjdk:11-jre-openj9-bionic
+FROM openjdk:11.0.7-jre-slim-buster
+
 RUN mkdir /opt/app
 
-COPY --from=build /build/xel-lite-wallet.jar /opt/app/xel-lite-wallet.jar
-COPY --from=sources /code/docker/start-lite-wallet.sh /opt/app/start-lite-wallet.sh
+COPY --from=build /build/xel-lite-wallet.jar /opt/app/xel-wallet.jar
 COPY --from=sources /code/run.sh /opt/app/run.sh
 COPY --from=sources /code/conf/ /opt/app/conf/
 COPY --from=sources /code/html/ /opt/app/html/
 COPY --from=sources /code/logs/ /opt/app/logs/
 
 WORKDIR /opt/app
-ENTRYPOINT bash start-lite-wallet.sh
+
+CMD java ${JAVA_OPTS} -cp xel-wallet.jar:conf nxt.Nxt