allow exec'ing service containers

src/args.rs

@@ -165,6 +165,7 @@ impl LogService {
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub enum ExecService {
     Db,
+    Service(Service),
 }
 
 impl HazeArgs {
@@ -232,6 +233,14 @@ impl HazeArgs {
                         args.next();
                         Some(ExecService::Db)
                     }
+                    Some(arg) => Service::from_type(&[], arg.as_ref())
+                        .into_iter()
+                        .filter_map(|services| services.into_iter().next())
+                        .next()
+                        .map(|service| {
+                            args.next();
+                            ExecService::Service(service)
+                        }),
                     _ => None,
                 };