FirstMate's changes for - FirstMate's changes for - Docker change

[firstmatebot]

Important

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Changes Made

• Updated Dockerfile to use Node.js version 20-alpine instead of 19-alpine.
• Added multi-stage builds for optimized image size and security.
• Set working directory to /usr/src/app.
• Installed git in the Dockerfile.
• Created a non-root user for enhanced security.

Remaining Tasks

• Ensure that all application dependencies are correctly copied and installed in the multi-stage build.

Things to Double Check

• Verify that the application runs correctly with the new user permissions.
• Test the application thoroughly to confirm that all functionalities work as expected before merging this PR.