chore: add github username to Member object

[AnandajithS]

• Added github_username: String to the Member struct
• Updated the references and usage of Member model to accommodate the new field

Closes #150

[hrideshmg]

Hi, thanks for the PR. Just a couple of things to fix before we can merge it:

• Since we’re adding a new database column, you’ll need to create a new migration using sqlx to insert the column.
• Please also update /src/database_seeder/seed.sql so our development data stays in sync with the latest schema.

Before opening the PR next time, it’d be great if you test your changes that would help catch issues like these early. Also, don’t forget to run rustfmt before committing (looks like the formatting check is currently failing).

[Copilot]

Pull Request Overview

This PR adds GitHub username support to the Member model by introducing a new github_user field. The changes ensure the new field is properly integrated across the data layer, GraphQL API, and database seeding.

• Added github_user: String field to Member struct and related input types
• Updated database queries to include the new field in INSERT and UPDATE operations
• Added database migration and updated seed data to include GitHub usernames

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/models/member.rs	Added github_user field to Member, CreateMemberInput, and UpdateMemberInput structs
src/graphql/mutations/member_mutations.rs	Updated SQL queries and parameter bindings to handle the new github_user field
src/database_seeder/seed.sql	Modified seed data to include github_user values for test data
migrations/20251011162144_add_github_user.sql	Added database migration to create the github_user column

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[hrideshmg]

LGTM! Thanks for fixing the track value in the seeder as well.