fix for robots.txt

Dockerfile

@@ -90,15 +90,11 @@ RUN set -x \
 	&& rm bin/*.bat \
 	&& rm tomcat.tar.gz* \
     && mkdir -p conf/Catalina \
-    && mkdir -p webapps/ROOT \
     && curl -o /usr/local/tomcat/lib/jstl1.2.jar https://build.shibboleth.net/nexus/service/local/repositories/thirdparty/content/javax/servlet/jstl/1.2/jstl-1.2.jar
-    
+
 ADD files/idp.xml conf/Catalina/idp.xml
 ADD files/server.xml conf/server.xml
 
-RUN mkdir -p /usr/local/tomcat/webapps/ROOT
-ADD files/robots.txt /usr/local/tomcat/webapps/ROOT/robots.txt
-
 ADD files/bin/setenv.sh /opt/tier/setenv.sh
 RUN chmod +x /opt/tier/setenv.sh
 ADD files/bin/startup.sh /usr/bin/startup.sh