ATS-341 : ATS: Shadow MNT-20344: ATS docker images should not run as root

- run docker engines as non-root user

alfresco-docker-tika/Dockerfile

@@ -8,6 +8,12 @@ FROM alfresco/alfresco-base-java:11.0.1-openjdk-centos-7-1fd3c4475374
 ENV APACHE_LICENSE_FILE=https://github.com/Alfresco/acs-community-packaging/blob/master/distribution/src/main/resources/licenses/3rd-party/Apache%202.0.txt
 ENV JAVA_OPTS="-Xms256M -Xmx2048M"
 
+# Set default user information
+ARG GROUPNAME=Alfresco
+ARG GROUPID=1000
+ARG USERNAME=tika
+ARG USERID=33004
+
 COPY target/alfresco-docker-tika-${env.project_version}.jar /usr/bin
 
 RUN ln /usr/bin/alfresco-docker-tika-${env.project_version}.jar /usr/bin/alfresco-docker-tika.jar && \
@@ -20,6 +26,12 @@ ADD target/generated-resources/licenses              /licenses
 ADD target/generated-resources/licenses.xml          /licenses/
 ADD target/generated-sources/license/THIRD-PARTY.txt /licenses/
 
+RUN groupadd -g ${GROUPID} ${GROUPNAME} && \
+    useradd -u ${USERID} -G ${GROUPNAME} ${USERNAME} && \
+    chgrp -R ${GROUPNAME} /usr/bin/alfresco-docker-tika.jar
+
 EXPOSE 8090
 
+USER ${USERNAME}
+
 ENTRYPOINT java $JAVA_OPTS -jar /usr/bin/alfresco-docker-tika.jar