config: adds flashbots endpoint env var

Author: dylanlott

src/config.rs

@@ -92,6 +92,14 @@ pub struct BuilderConfig {
     )]
     pub tx_broadcast_urls: Vec<Cow<'static, str>>,
 
+    /// Flashbots endpoint for privately submitting rollup blocks.
+    #[from_env(
+        var = "FLASHBOTS_ENDPOINT",
+        desc = "Flashbots endpoint for privately submitting rollup blocks",
+        optional
+    )]
+    pub flashbots_endpoint: url::Url,
+
     /// Address of the Zenith contract on Host.
     #[from_env(var = "ZENITH_ADDRESS", desc = "address of the Zenith contract on Host")]
     pub zenith_address: Address,

src/test_utils.rs

@@ -32,6 +32,7 @@ pub fn setup_test_config() -> Result<BuilderConfig> {
             .try_into()
             .unwrap(),
         tx_broadcast_urls: vec!["http://localhost:9000".into()],
+        flashbots_endpoint: "http://localhost:9062".parse().unwrap(), // NB: Flashbots API default 
         zenith_address: Address::default(),
         quincey_url: "http://localhost:8080".into(),
         builder_port: 8080,