feat: add pre and post hook support when entering a kubert ctx shell

[idebeijer]

This PR adds pre and post hook support for the kubert ctx shell command, allowing users to execute custom shell commands before entering and after exiting a Kubernetes context shell.

Key Changes:

• Added Hooks configuration with PreShell and PostShell fields
• Modified shell launching logic to execute hooks and set the KUBERT_CONTEXT environment variable
• Added comprehensive documentation with examples for configuring shell hooks

[Copilot]

Pull Request Overview

This PR adds pre and post hook support for the kubert ctx shell command, allowing users to execute custom shell commands before entering and after exiting a Kubernetes context shell.

Key Changes:

• Added Hooks configuration struct with PreShell and PostShell fields
• Modified shell launching logic to execute hooks and set the KUBERT_CONTEXT environment variable
• Added comprehensive documentation with examples for configuring shell hooks

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
internal/config/config.go	Adds Hooks struct with pre/post shell command fields and default configuration values
cmd/context.go	Implements hook execution logic, extracts shell detection to getUserShell(), and sets KUBERT_CONTEXT env var
README.md	Documents shell hooks feature with configuration examples and common use cases

Comments suppressed due to low confidence (1)

cmd/context.go:261

• The executeHook() function lacks a docstring. Consider documenting the parameters (hookCommand and hookType), what the function does, and its return behavior.

func executeHook(hookCommand, hookType string) error {
	hookCmd := exec.Command(getUserShell(), "-c", hookCommand)
	hookCmd.Env = os.Environ()
	hookCmd.Stdout = os.Stdout
	hookCmd.Stderr = os.Stderr

	if err := hookCmd.Run(); err != nil {
		return fmt.Errorf("%s hook failed: %w", hookType, err)
	}

	return nil
}

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