Tomcat 8 + Docker : add custom directory in classpath (Method #2 : define CLASSPATH in bin/setenv.sh)

Dockerfile

FROM tomcat:8.5-jre8

# $CATALINA_HOME is defined in tomcat image
ADD target/my-webapp*.war $CATALINA_HOME/webapps/my-webapp.war

# Application config
RUN mkdir $CATALINA_HOME/app_conf/
ADD src/main/config/test.properties $CATALINA_HOME/app_conf/

# Create "$CATALINA_HOME/bin/setenv.sh"
# Escape char : https://docs.docker.com/engine/reference/builder/#/escape
RUN echo "# Add app_conf to Tomcat CLASSPATH" > $CATALINA_HOME/bin/setenv.sh
RUN echo "CLASSPATH=\$CATALINA_HOME/app_conf/" >> $CATALINA_HOME/bin/setenv.sh
RUN chmod 750 $CATALINA_HOME/bin/setenv.sh

# Check : docker exec my-webapp cat /usr/local/tomcat/bin/setenv.sh