hostcert.pem and hostkey.pem are not included in /opt/tomcat/conf

Dockerfile does not include logic to install host cert, per instructions in README.md

"The Dockerfile expects that an X509 host certificate and key pair exists in this directory with the names hostcert.pem and hostkey.pem. Obtain these files and add them to this directory before building the Docker image. The .gitignore file will prevent these files being added to the repository."