Update Dockerfile: Added Comments to briefly explain the instructions.

[Piyush-r-bhaskar]

What should this PR do?

Explains the purpose and functionality of each instructions.

Why are we making this change?

Dockerfiles can become complex, especially with multi-stage builds and intricate instructions. Comments help explain the purpose and functionality of each instructions, making it easier for others (and your future self) to understand what each step does.

Commented Dockerfiles act as living documentation. They help teammates comprehend the build process, encouraging collaboration and reducing the chances of errors.

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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.