Use a non-root user in container images for improved security

[sourcery-ai]

Currently, our container images default to running the application as the root user. For improved security, we should create and switch to a non-root user before starting the application. This change will help reduce the risk of privilege escalation and other security vulnerabilities.

Action items:

• Update the main application container to use a non-root user.
• Apply the same change to builder/Containerfile to ensure consistency and security across all container builds.

Suggested steps:

1. Create a non-root user in the Dockerfile/Containerfile.
2. Set the user context to the newly created non-root user before starting the application.
3. Test the containers to ensure the application runs correctly under the non-root user.

Let’s track this enhancement here so it isn’t forgotten.

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I created this issue for @lcarva from #16 (comment).

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