-i to override the default server file used by the deploy file

src/main.rs

@@ -466,12 +466,22 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 .help("Set additional variables as key=value, JSON, or @file")
                 .num_args(1),
         )
+        .arg(
+            Arg::new("server_file")
+                .short('i')
+                .long("inventory")
+                .value_name("FILE")
+                .help("The server configuration YAML file")
+                .num_args(1),
+        )
         .get_matches();
 
     let deploy_file = matches.get_one::<String>("deploy_file").unwrap();
     let extra_vars = matches.get_one::<String>("extra_vars").map(|s| s.as_str());
+    let default_server_file = "servers.yml".to_string();
+    let server_file = matches.get_one::<String>("server_file").unwrap_or(&default_server_file);
 
-    let server_config: ServerConfig = read_yaml("servers.yml")?;
+    let server_config: ServerConfig = read_yaml(server_file)?;
     let deployment_docs: Vec<Vec<Deployment>> = read_yaml_multi(deploy_file)?;
     let deployments = deployment_docs.into_iter().flatten().collect::<Vec<_>>();