Optimize Dockerfile to Improve Build Efficiency and Reduce Rebuilds

[devanmolx]

Description

Optimized the Dockerfile to improve build performance by leveraging Docker layer caching. The change moves the npm install step to run after copying only package*.json, so dependencies don't need to be reinstalled unless package.json changes. This reduces rebuild times when modifying source code files.

Related issue

#930

How Has This Been Tested?

Tested the changes by building the Docker image before and after modifying the Dockerfile. Verified that:

1.) Rebuilding after modifying source code does not rerun npm install.
2.) Image builds faster as dependencies are cached unless package.json changes.

Screenshots (if appropriate):

Types of changes

• [ x] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[dpgiakatos]

Violation of contribution guidelines:
PRs from contributors who are not assigned to an issue will be automatically closed.