Update database_args.rs to enable nfs support with flag

the purpose of this is to further extend paradigmxyz#6755 and allow for `--db.exclusive=true` to be used to support nfs volumes

crates/node-core/src/args/database_args.rs

@@ -12,13 +12,17 @@ pub struct DatabaseArgs {
     /// Database logging level. Levels higher than "notice" require a debug build.
     #[arg(long = "db.log-level", value_enum)]
     pub log_level: Option<LogLevel>,
+    /// Open environment in exclusive/monopolistic mode. Enabling allows nfs volumes
+    #[arg(long = "db.exclusive", exclusive = false)]
+    pub exclusive: Option<bool>
 }
 
 impl DatabaseArgs {
     /// Returns default database arguments with configured log level and client version.
     pub fn database_args(&self) -> reth_db::mdbx::DatabaseArguments {
         reth_db::mdbx::DatabaseArguments::new(default_client_version())
             .with_log_level(self.log_level)
+            .with_exclusive(self.exclusive)
     }
 }