Streamline packaging of the Hosted LibreCores CI and Docker images

[oleg-nenashev]

Currently Docker images differ from the LibreCores CI Web instance. We should unify the Pipelines for it. Suggested approach:

• Jenkins Custom WAR Packager is used to define the Docker and Production environments
  ** All configurations except credentials are included into the bundle so that they are immutable on the server;s side
• Docker and Librecores CI dev images are packaged using the same scripts
• Plugins are updated to recent versions so that we start from a modern setup