Change env var to P_FS_DIR (#246)

Author: trueleo

server/src/storage/localfs.rs

@@ -51,7 +51,7 @@ use super::{LogStream, ObjectStorage, ObjectStorageError, ObjectStorageProvider}
 )]
 pub struct FSConfig {
     #[arg(
-        env = "P_FS_PATH",
+        env = "P_FS_DIR",
         value_name = "filesystem path",
         default_value = "./data",
         value_parser = validation::canonicalize_path