fix: implement default trait for Global struct and remove redundant Default derive, so that health server starts with port 8080 instead of 0 which makes it random.

- Removed the Default derive from the Global struct and implemented a custom default method.
- The new default method initializes the struct with default values for contracts, etherscan_api_key, and health_port.

This fixes that by using the default health port

Author: ricardo-perello

core/src/manifest/global.rs

@@ -6,7 +6,7 @@ pub fn default_health_port() -> u16 {
     8080
 }
 
-#[derive(Debug, Serialize, Deserialize, Default, Clone)]
+#[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct Global {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub contracts: Option<Vec<Contract>>,
@@ -17,3 +17,9 @@ pub struct Global {
     #[serde(default = "default_health_port")]
     pub health_port: u16,
 }
+
+impl Default for Global {
+    fn default() -> Self {
+        Self { contracts: None, etherscan_api_key: None, health_port: default_health_port() }
+    }
+}