Dockerfile update

[CrzyHAX91]

Summary by Sourcery

Update the Dockerfile to optimize the build process and enhance security by using a slimmer base image, installing necessary system dependencies, and running the application as a non-root user.

Build:

• Update the Dockerfile to use a slimmer base image for reduced image size.
• Add installation of system dependencies for building Python packages.
• Implement multi-stage build to improve caching by copying requirements separately before other files.
• Switch to a non-root user for running the application to enhance security.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the Dockerfile to implement several Docker best practices, including using a slim base image, multi-stage builds, improved layer caching, and security enhancements. The changes optimize the container build process and improve the security posture of the application.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Switch to a lighter base image and optimize environment variables	Changed base image from python:3.9 to python:3.9-slim Consolidated environment variables into a single layer Added APP_HOME environment variable for consistency	Dockerfile
Improve build efficiency and layer caching	Separated requirements installation from application code copying Added specific system dependencies installation with cleanup Optimized apt-get commands to reduce layer size	Dockerfile
Implement security best practices	Created and switched to non-root user 'appuser' Set appropriate ownership permissions for application files Removed setup.py execution from build process	Dockerfile

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[sourcery-ai]

We have skipped reviewing this pull request. We don't review packaging changes - Let us know if you'd like us to change this.