feat: Add pxe example and new data files structure

data/pxe/okd/README.md

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+Here lies all the data files required for an OKD cluster PXE boot setup.
+
+This inclues ISO files, binary boot files, ipxe, etc.

examples/okd_pxe/Cargo.toml

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+[package]
+name = "example-pxe"
+edition = "2024"
+version.workspace = true
+readme.workspace = true
+license.workspace = true
+publish = false
+
+[dependencies]
+harmony = { path = "../../harmony" }
+harmony_cli = { path = "../../harmony_cli" }
+harmony_types = { path = "../../harmony_types" }
+cidr = { workspace = true }
+tokio = { workspace = true }
+harmony_macros = { path = "../../harmony_macros" }
+log = { workspace = true }
+env_logger = { workspace = true }
+url = { workspace = true }

examples/okd_pxe/src/main.rs

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+mod topology;
+
+use harmony::{
+    modules::{dhcp::DhcpScore, tftp::TftpScore},
+    score::Score,
+    topology::{HAClusterTopology, Url},
+};
+
+use crate::topology::{get_inventory, get_topology};
+
+#[tokio::main]
+async fn main() {
+    let inventory = get_inventory();
+    let topology = get_topology().await;
+    let gateway_ip = topology.router.get_gateway();
+
+    let scores: Vec<Box<dyn Score<HAClusterTopology>>> = vec![
+        Box::new(DhcpScore {
+            host_binding: vec![],
+            next_server: Some(topology.router.get_gateway()),
+            boot_filename: None,
+            filename: Some("undionly.kpxe".to_string()),
+            filename64: Some("ipxe.efi".to_string()),
+            filenameipxe: Some(format!("http://{gateway_ip}:8080/boot.ipxe").to_string()),
+        }),
+        Box::new(TftpScore {
+            files_to_serve: Url::LocalFolder("./data/pxe/okd/tftpboot/".to_string()),
+        }),
+    ];
+
+    harmony_cli::run(inventory, topology, scores, None).await.unwrap();
+}

examples/okd_pxe/src/topology.rs

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+use std::{
+    net::{IpAddr, Ipv4Addr},
+    sync::Arc,
+};
+
+use cidr::Ipv4Cidr;
+use harmony::{
+    hardware::{FirewallGroup, HostCategory, Location, PhysicalHost, SwitchGroup},
+    infra::opnsense::OPNSenseManagementInterface,
+    inventory::Inventory,
+    topology::{HAClusterTopology, LogicalHost, UnmanagedRouter},
+};
+use harmony_macros::{ip, ipv4};
+
+pub async fn get_topology() -> HAClusterTopology {
+    let firewall = harmony::topology::LogicalHost {
+        ip: ip!("192.168.1.1"),
+        name: String::from("opnsense-1"),
+    };
+
+    let opnsense = Arc::new(
+        harmony::infra::opnsense::OPNSenseFirewall::new(firewall, None, "root", "opnsense").await,
+    );
+    let lan_subnet = ipv4!("192.168.1.0");
+    let gateway_ipv4 = ipv4!("192.168.1.1");
+    let gateway_ip = IpAddr::V4(gateway_ipv4);
+    harmony::topology::HAClusterTopology {
+        domain_name: "demo.harmony.mcd".to_string(),
+        router: Arc::new(UnmanagedRouter::new(
+            gateway_ip,
+            Ipv4Cidr::new(lan_subnet, 24).unwrap(),
+        )),
+        load_balancer: opnsense.clone(),
+        firewall: opnsense.clone(),
+        tftp_server: opnsense.clone(),
+        http_server: opnsense.clone(),
+        dhcp_server: opnsense.clone(),
+        dns_server: opnsense.clone(),
+        control_plane: vec![LogicalHost {
+            ip: ip!("10.100.8.20"),
+            name: "cp0".to_string(),
+        }],
+        bootstrap_host: LogicalHost {
+            ip: ip!("10.100.8.20"),
+            name: "cp0".to_string(),
+        },
+        workers: vec![],
+        switch: vec![],
+    }
+}
+
+pub fn get_inventory() -> Inventory {
+    Inventory {
+        location: Location::new(
+            "Some virtual machine or maybe a physical machine if you're cool".to_string(),
+            "testopnsense".to_string(),
+        ),
+        switch: SwitchGroup::from([]),
+        firewall: FirewallGroup::from([PhysicalHost::empty(HostCategory::Firewall)
+            .management(Arc::new(OPNSenseManagementInterface::new()))]),
+        storage_host: vec![],
+        worker_host: vec![],
+        control_plane_host: vec![],
+    }
+}