Add generated postcode files

[rm-hull]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @rm-hull, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates essential generated postcode data directly into the Docker image. By adding a new COPY instruction to the Dockerfile, the application running inside the container will now have access to these files, ensuring it can operate with the required geographical data.

Highlights

• Dockerfile Update: Added a COPY instruction to include generated postcode files from the host's ./data/postcodes directory into the /app/data/postcodes path within the Docker image.

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[github-actions]

	Tests	Passed ❌️	Skipped	Failed
JUnit Test Report	0 ran	0 passed	0 skipped	0 failed

Test	Result
No test annotations available

• View JUnit Test Report

[gemini-code-assist]

Code Review

The pull request adds generated postcode data to the Docker image. The Dockerfile is configured to run a web service, but it's building and running a command-line data processing tool instead, which is a critical issue.