feat(tvix/store): impl From<PoisonError> for Error

Change-Id: Ib61e276b45c0102e383a7e7e641172b151369b03
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8207
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

tvix/store/src/errors.rs

@@ -1,3 +1,4 @@
+use std::sync::PoisonError;
 use thiserror::Error;
 
 /// Errors related to communication with the store.
@@ -9,3 +10,9 @@ pub enum Error {
     #[error("internal storage error: {0}")]
     StorageError(String),
 }
+
+impl<T> From<PoisonError<T>> for Error {
+    fn from(value: PoisonError<T>) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}