fix: [#706] Setting timezone in MySQL DSN (e.g., Asia/Shanghai) causes “invalid DSN” error

[hwbrzzl]

📑 Description

Closes goravel/goravel#706

This pull request refines the handling of timezones in the configuration logic by removing hardcoded defaults and introducing a fallback mechanism to use the application's timezone when a database connection-specific timezone is not provided. Additionally, it updates the corresponding tests to ensure this behavior is properly validated.

Configuration Updates:

• Removed the hardcoded "timezone": "UTC" from the example configuration in README.md.
• Updated fillDefault in config.go to set the timezone dynamically. If no database connection-specific timezone is provided, it falls back to the application's timezone (app.timezone) with a default of "UTC".

Testing Enhancements:

• Added a new test case in config_test.go to verify the fallback mechanism for the timezone when app.timezone is used.

✅ Checks

• Added test cases for my code

[Copilot]

Pull Request Overview

This PR refines the timezone handling in the database configuration by removing a hardcoded default and introducing a fallback to the application's timezone when a connection-specific timezone is not provided. Key changes include:

• Addition of a new test case in config_test.go ("success with app.timezone") to verify the fallback mechanism.
• Modification of fillDefault in config.go to use a fallback from "app.timezone" when the connection-specific timezone is empty.
• Update of README.md to remove a hardcoded timezone default.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
config_test.go	Added test case for verifying timezone fallback from "app.timezone".
config.go	Added fallback logic for setting timezone dynamically in the fillDefault method.
README.md	Removed the default "timezone" configuration value.

[Copilot]

[nitpick] Consider refactoring the fallback logic by directly using a GetString call that allows specifying a default value (e.g., r.config.GetString(key, default)) to improve readability and reduce redundant calls.

Suggested change

	timezone := r.config.GetString(fmt.Sprintf("database.connections.%s.timezone", r.connection))
	if timezone == "" {
	timezone = r.config.GetString("app.timezone", "UTC")
	}
	fullConfig.Timezone = timezone
	fullConfig.Timezone = r.config.GetString(fmt.Sprintf("database.connections.%s.timezone", r.connection), r.config.GetString("app.timezone", "UTC"))