Optimised dokerfile for backend and added .dockerignore

[abhayymishraa]

Optimized the Docker build process by implementing multi-stage builds that separate build and runtime environments.

Enhanced efficiency through minimal dependency installation using --no-install-recommends flag, while optimizing system libraries and pip package management.

Also Included .dockerignore file so that the image should contain only necessay files.

The new architecture includes configured image storage directories and necessary port exposures, resulting in reduced image size and improved resource usage.

Size is reduced which will be directly propotional to performance

Results

Everything is working and backend is successfull running in the port 8000

All changes have been thoroughly tested and verified in the target environment.

closes
#63