Update README with Docker setup instructions and clean up init-db script

[mayura-andrew]

Purpose

The purpose of this PR is to fix #189

Goals

Update the Dockerfile to include necessary dependencies for database migration.
Create the new init-db.sh script to handle database initialization,and seeding.
Modify the docker-compose.yml file to run the init-db.sh script during container startup.

Approach

Updated and created required tasks.

Screenshots

Checklist

• This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Related PRs

Test environment

Learning

[anjula-sack]

Suggested change

[anjula-sack]

Thank you! @mayura-andrew