Add image metadata, allow flags to be overridden, and tzdata

[kgaughan]

Summary by Sourcery

Update the README to include instructions for running the daemon in a Docker container.

Documentation:

• Add instructions for running the daemon in a Docker container to the README.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds instructions for running the application under Docker to the README.md file. It provides a simple command to start the daemon in a Docker container, which enhances the project's documentation and makes it easier for users to deploy the application using containerization.

File-Level Changes

Change	Details	Files
Added Docker instructions to README	Included a new section titled 'Running under Docker' Added a Docker command to start the daemon in a container Specified the Docker image to use (ghcr.io/kgaughan/nxtp:latest) Included port mapping information (-p 12300:12300)	README.md

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[sourcery-ai]

Hey @kgaughan - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 1 issue found

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[sourcery-ai]

suggestion (documentation): Consider adding a brief explanation of the Docker command and port usage.

It might be helpful to explain what the command does and mention if the port number can be changed. This would assist users who are less familiar with Docker or who need to use a different port.

Suggested change

	docker run -d -p 12300:12300 ghcr.io/kgaughan/nxtp:latest
	To start the daemon in a Docker container, run:
	```sh
	# Run the NXTP container in detached mode, mapping port 12300
	# You can change the first 12300 to use a different host port
	docker run -d -p 12300:12300 ghcr.io/kgaughan/nxtp:latest

This command runs the container in detached mode (-d) and maps the container's port 12300 to the host's port 12300.