custom config and key paths for detee-api

Allows to specify custom paths for the configuration file and wallet key by using the `DETEE_API_USER_PATH` environment variable.

src/config.rs

@@ -196,13 +196,29 @@ impl Config {
     }
 
     fn config_path() -> Result<String, Error> {
-        let config_path = Self::cli_dir_path()? + ("/cli-config.yaml");
-        Ok(config_path)
+        match std::env::var("DETEE_API_USER_PATH") {
+            Ok(user_path) => {
+                let config_path = format!("{user_path}/cli-config.yaml");
+                Ok(config_path)
+            }
+            _ => {
+                let config_path = Self::cli_dir_path()? + ("/cli-config.yaml");
+                Ok(config_path)
+            }
+        }
     }
 
     fn detee_wallet_key_path() -> Result<String, Error> {
-        let config_path = Self::cli_dir_path()? + ("/secret_detee_wallet_key");
-        Ok(config_path)
+        match std::env::var("DETEE_API_USER_PATH") {
+            Ok(user_path) => {
+                let config_path = format!("{user_path}/secret_detee_wallet_key");
+                Ok(config_path)
+            }
+            _ => {
+                let config_path = Self::cli_dir_path()? + ("/secret_detee_wallet_key");
+                Ok(config_path)
+            }
+        }
     }
 
     fn load_config_from_file() -> Result<Self, Error> {