Set environment variables using ENV rather than bashrc.

This method of setting environment variables should be more reliable.
Docker will set them even when you override the command to execute and
try to execute something other than a bash shell (e.g., sqlplus).

Author: Spencer Rinehart

Dockerfile

@@ -19,9 +19,9 @@ RUN mv /initXETemp.ora /u01/app/oracle/product/11.2.0/xe/config/scripts
 
 RUN printf 8080\\n1521\\noracle\\noracle\\ny\\n | /etc/init.d/oracle-xe configure
 
-RUN echo 'export ORACLE_HOME=/u01/app/oracle/product/11.2.0/xe' >> /etc/bash.bashrc
-RUN echo 'export PATH=$ORACLE_HOME/bin:$PATH' >> /etc/bash.bashrc
-RUN echo 'export ORACLE_SID=XE' >> /etc/bash.bashrc
+ENV ORACLE_HOME /u01/app/oracle/product/11.2.0/xe
+ENV PATH /u01/app/oracle/product/11.2.0/xe/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
+ENV ORACLE_SID XE
 
 EXPOSE 22
 EXPOSE 1521