fix(agent-data-plane): allow check config files without init_config

lib/saluki-env/src/autodiscovery/providers/local.rs

@@ -78,6 +78,7 @@ impl LocalAutodiscoveryProvider {
 
 #[derive(Debug, Deserialize)]
 struct LocalCheckConfig {
+    #[serde(default = "HashMap::new")]
     init_config: HashMap<String, serde_yaml::Value>,
     instances: Vec<HashMap<String, serde_yaml::Value>>,
 }
@@ -274,6 +275,16 @@ mod tests {
         assert_eq!(config.source, "local");
     }
 
+    #[tokio::test]
+    async fn test_parse_minimal_config_file() {
+        let test_file = test_data_path().join("test-minimal-config.yaml");
+
+        let (_, config) = parse_config_file(&test_file).await.unwrap();
+
+        // Parsing a config without `init_config` yields an empty hash map for that field.
+        assert!(config.init_config.value.is_empty());
+    }
+
     #[tokio::test]
     async fn test_scan_and_emit_events_new_config() {
         let dir = tempdir().unwrap();

lib/saluki-env/src/autodiscovery/providers/test_data/test-minimal-config.yaml

@@ -0,0 +1,5 @@
+## This file is used for testing the parse_config_file function
+## Minimal test configuration
+
+instances:
+  -