create yaml files for kubernetes with nginx ingress rules in rust

main.rs
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use serde_yaml::{Value, to_string};

#[derive(Debug, Serialize, Deserialize)]
struct IngressRule {
    api_version: String,
    kind: String,
    metadata: HashMap<String, Value>,
    spec: HashMap<String, Value>,
}

fn main() {
    let mut metadata = HashMap::new();
    metadata.insert("name".to_string(), Value::String("example-ingress".to_string()));

    let mut labels = HashMap::new();
    labels.insert("app".to_string(), Value::String("example-app".to_string()));

    let mut annotations = HashMap::new();
    annotations.insert("nginx.ingress.kubernetes.io/rewrite-target".to_string(), Value::String("/".to_string()));

    let mut spec = HashMap::new();
    spec.insert("rules".to_string(), Value::Array(vec![
        Value::Object(HashMap::from([
            ("host".to_string(), Value::String("example.com".to_string())),
            ("http".to_string(), Value::Object(HashMap::from([
                ("paths".to_string(), Value::Array(vec![
                    Value::Object(HashMap::from([
                        ("path".to_string(), Value::String("/example".to_string())),
                        ("pathType".to_string(), Value::String("Exact".to_string())),
                        ("backend".to_string(), Value::Object(HashMap::from([
                            ("service".to_string(), Value::Object(HashMap::from([
                                ("name".to_string(), Value::String("example-service".to_string())),
                                ("port".to_string(), Value::Object(HashMap::from([
                                    ("name".to_string(), Value::String("http".to_string())),
                                ]))),
                            ]))),
                            ("resource".to_string(), Value::String("example-resource".to_string())),
                        ]))),
                    ]))),
                ]))),
            ]))),
        ])),
    ]));

    let ingress_rule = IngressRule {
        api_version: String::from("networking.k8s.io/v1"),
        kind: String::from("Ingress"),
        metadata,
        spec,
    };

    let ingress_rule_yaml = to_string(&ingress_rule).unwrap();
    println!("{}", ingress_rule_yaml);
}
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