improved docker image creation

• Use COPY instead of ADD to download extensions.
• Create a non-root user (java:java) to execute the application.
• Use /home/java as WORKDIR to allocate all files.
• Add exec to entrypoint.sh to replace the shell process by the JVM,
  avoiding custom implementation for trap signals.
• Use RUN instead of ADD to download Java Cryptography Extension.
• Update NR APM agent to 3.45.0

1.2

update newrelic agent to 3.44.1 version

1.1

update newrelic agent to version 3.39.1

1.0

update newrelic agent to 0.39.0