Use non-root user in Dockerfile

Signed-off-by: ecaiyanlinux <martin.c.yan@est.tech>
Issue-ID: NONRTRIC-656
Change-Id: Ib85abd9de806b30b73af34a863b06c7663026c3d
diff --git a/dmaap-adaptor-java/Dockerfile b/dmaap-adaptor-java/Dockerfile
index b2c0c30..9843699 100644
--- a/dmaap-adaptor-java/Dockerfile
+++ b/dmaap-adaptor-java/Dockerfile
@@ -30,14 +30,18 @@
 RUN mkdir -p /var/log/dmaap-adaptor-service
 RUN mkdir -p /opt/app/dmaap-adaptor-service/etc/cert/
 RUN mkdir -p /var/dmaap-adaptor-service
-RUN chmod -R 777 /var/dmaap-adaptor-service
 
 ADD /config/application.yaml /opt/app/dmaap-adaptor-service/config/application.yaml
 ADD /config/application_configuration.json /opt/app/dmaap-adaptor-service/data/application_configuration.json_example
 ADD /config/keystore.jks /opt/app/dmaap-adaptor-service/etc/cert/keystore.jks
 ADD /config/truststore.jks /opt/app/dmaap-adaptor-service/etc/cert/truststore.jks
 
-RUN chmod -R 777 /opt/app/dmaap-adaptor-service/config/
+
+RUN groupadd -g 999 appuser && \
+    useradd -r -u 999 -g appuser appuser
+RUN chown -R appuser:appuser /var/dmaap-adaptor-service/
+RUN chown -R appuser:appuser /opt/app/dmaap-adaptor-service/
+USER appuser
 
 ADD target/${JAR} /opt/app/dmaap-adaptor-service/dmaap-adaptor.jar
 CMD ["java", "-jar", "/opt/app/dmaap-adaptor-service/dmaap-adaptor.jar"]