Once the first version is ready to be released, it would be great to add it to https://github.com/jenkinsci/docker and update install-plugins.sh to use the new tool.

Acceptance criteria:

• Plugin Manager tool is released (as alpha?)
• Plugin Manager tool is added to the Docker distribution
• Scripts are updated to invoke the tool during execution. All features are retained so that the tool is fully compatible.
• Documentation is updated to reference the tool