Add Basic Dockerfile

[twa16]

Summary:
This PR adds a minimal multi-stage Dockerfile to provide a consistent containerized environment for building and testing the project. It helps streamline local development, CI integration, and onboarding by encapsulating dependencies. It is also helpful for running the software locally quickly.

Documentation:
I think it would be helpful to add documentation on how to run this quickly. I am just not sure if you all would want that in the README, the Developer Guide, or in a separate markdown file. Happy to add that if you all point me in the right direction.

[earocorn]

This is great, but the default OSGi bundle repo in dist/osgi/config.json is quite outdated, and developers often use the osh-node-dev-template project for testing core, addon, and build changes together. Would you be able to create a similar Dockerfile for osh-addons, and a docker-compose.yml for osh-node-dev-template? Then we could test containerized environments of the individual repos (osh-addons & osh-core), as well as the two working together.

It would be great to have an easy way to set up both an OSGi bundle repository server (with osh-addons) and OSH server (osh-core), with the local bundle server linked to the local OSH node.

We can also work on adding this documentation for containerized deployments/testing in the osh-docs repository.

[twa16]

Ok! That works!

I am thinking we keep this open until I wrap that up and we can add a little blurb to the readme that leads to that Dockerfile in the other repo?