updating dockerfile to use gen3 user

Dockerfile

@@ -1,13 +1,12 @@
 # To check running container: docker exec -it tube /bin/bash
 ARG AZLINUX_BASE_VERSION=master
 
-FROM quay.io/cdis/python-nginx-al:${AZLINUX_BASE_VERSION} AS base
+FROM quay.io/cdis/python-build-base:${AZLINUX_BASE_VERSION} AS base
 
 # create gen3 user
 # Create a group 'gen3' with GID 1000 and a user 'gen3' with UID 1000
-# RUN groupadd -g 1000 gen3 && \
-#     useradd -m -s /bin/bash -u 1000 -g gen3 gen3
-#will change to gen3 user later
+RUN groupadd -g 1000 gen3 && \
+    useradd -m -s /bin/bash -u 1000 -g gen3 gen3
 
 WORKDIR /gen3spark
 
@@ -35,6 +34,7 @@ RUN yum update && yum install -y --setopt=install_weak_deps=False \
     gnutls gnutls-devel \
     wget \
     tar \
+    ca-certificates-java \
     && yum clean all
 
 RUN wget $SPARK_INSTALLATION_URL \
@@ -67,7 +67,6 @@ COPY --from=builder ${SPARK_HOME} ${SPARK_HOME}
 COPY --from=builder ${HADOOP_HOME} ${HADOOP_HOME}
 COPY --from=builder ${SCALA_HOME} ${SCALA_HOME}
 
-
 # Install runtime dependencies
 RUN yum update && yum install -y --setopt=install_weak_deps=False \
     java-11-amazon-corretto java-11-amazon-corretto-devel \
@@ -87,8 +86,6 @@ ENV HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop \
     JAVA_HOME="/usr/lib/jvm/java-11-amazon-corretto" \
     PATH="${PATH}:${SPARK_HOME}/bin:${SPARK_HOME}/sbin:${HADOOP_HOME}/sbin:${HADOOP_HOME}/bin:${JAVA_HOME}/bin:${SCALA_HOME}/bin}"
 
-
-
 RUN echo 'export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true -Dsun.security.krb5.debug=true -Dsun.security.spnego.debug"' >> $HADOOP_CONF_DIR/hadoop-env.sh && \
     echo 'export HADOOP_OS_TYPE="${HADOOP_OS_TYPE:-$(uname -s)}"' >> ${HADOOP_CONF_DIR}/hadoop-env.sh && \
     echo 'export HDFS_NAMENODE_OPTS="-Dhadoop.security.logger=INFO,RFAS"' >> $HADOOP_CONF_DIR/hadoop-env.sh && \
@@ -121,6 +118,11 @@ EXPOSE 22 4040 7077 8020 8030 8031 8032 8042 8088 9000 10020 19888 50010 50020 5
 RUN mkdir -p /var/run/sshd ${HADOOP_HOME}/hdfs ${HADOOP_HOME}/hdfs/data ${HADOOP_HOME}/hdfs/data/dfs ${HADOOP_HOME}/hdfs/data/dfs/namenode ${HADOOP_HOME}/logs \
         && ssh-keygen -A
 
+# Change owner to gen3 user
+RUN chown -R gen3:gen3 ${SPARK_HOME} ${HADOOP_HOME} ${SCALA_HOME} ${JAVA_HOME}
+
+USER gen
+
 COPY . /gen3spark
 WORKDIR /gen3spark