Add MySQL database support with YAML and environment configuration

[Copilot]

Extends database support beyond SQLite to include MySQL, configurable via YAML or environment variables.

Changes

Configuration

• Added database.type, host, port, database, username, password fields to DatabaseConfig
• Environment variables: TW_DATABASE_TYPE, TW_DATABASE_HOST, TW_DATABASE_PORT, TW_DATABASE_NAME, TW_DATABASE_USERNAME, TW_DATABASE_PASSWORD
• Default remains SQLite when type is unset or "sqlite"

Database Initialization

• NewDatabase() now switches between SQLite and MySQL dialectors based on database.type
• Validates required MySQL fields (host, database, username) at startup
• SQLite-specific PRAGMAs only applied for SQLite connections

Example Configuration

database:
  type: mysql
  host: db.example.com
  port: 3306
  database: taskwizard
  username: appuser
  password: secret
  migration: true

Or via environment:

export TW_DATABASE_TYPE=mysql
export TW_DATABASE_HOST=db.example.com
export TW_DATABASE_NAME=taskwizard
export TW_DATABASE_USERNAME=appuser
export TW_DATABASE_PASSWORD=secret

Dependencies

• Added gorm.io/driver/mysql for MySQL connectivity

Original prompt

Add support for using a MySQL/MariaDB database on top of the existing Sqlite option. Make sure that config can be set both using the yaml file and env variables. Document that in the README. Make as fewer changes as possible to the code

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[Copilot]

Pull Request Overview

This PR extends database support beyond SQLite to include MySQL/MariaDB, with configuration available through both YAML files and environment variables. The default behavior (SQLite) is preserved when the database type is unset or explicitly set to "sqlite".

Key Changes:

• Added MySQL database support alongside existing SQLite functionality
• Extended DatabaseConfig with MySQL-specific fields (type, host, port, database, username, password)
• Implemented validation for required MySQL configuration fields at startup

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apiserver/config/config.go	Extended DatabaseConfig struct with MySQL fields and added environment variable bindings
apiserver/config/config.yaml	Added type: sqlite to explicitly document default database type
apiserver/config/config.dev.yaml	Added type: sqlite to development configuration
apiserver/config/config_test.go	Added comprehensive tests for MySQL configuration via YAML and environment variables
apiserver/internal/utils/database/database.go	Implemented database type switching logic with MySQL DSN construction and SQLite-specific PRAGMA handling
apiserver/internal/utils/database/database_test.go	Added validation tests for MySQL required fields and unsupported database types
apiserver/go.mod	Added gorm.io/driver/mysql dependency and updated GORM version
README.md	Documented MySQL configuration options with examples for both YAML and environment variables

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[codecov]

Codecov Report

❌ Patch coverage is 62.85714% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
apiserver/internal/utils/database/database.go	55.17%	10 Missing and 3 partials ⚠️

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