Specifying an 'override' context in the kubectl example app

[mgs255]

Hi.

I have a little command like app, which like kubectl allows the user to specify --context and --namespace args. Here we're creating a client for the Endpoints Api:

    let client = if arguments.get_context().is_some() {
        let options = KubeConfigOptions {
            context: arguments.get_context(),
            cluster: None,
            user: None,
        };
        let config = kube::Config::from_kubeconfig(&options).await?;
        Client::try_from(config)?
    } else {
        Client::try_default().await?
    };
    let endpoints: Api<Endpoints> = if let Some(n) = arguments.get_namespace() {
        Api::namespaced(client, &n)
    } else {
        Api::default_namespaced(client)
    };

Being a bit of rust noobie, this took me a while to come up without any examples. Would it be worthwhile including something like this in the kubectl example app? Maybe something like this?

#[tokio::main]
async fn main() -> Result<()> {
    tracing_subscriber::fmt::init();
    let app: App = clap::Parser::parse();

    let options = KubeConfigOptions {
        context: app.context,
        cluster: None,
        user: None,
    };
    let config = kube::Config::from_kubeconfig(&options).await?;
    let client = Client::try_from(config)?;
    ...

Where the app has been extended with:

    #[arg(long, short)]
    context: Option<String>,