Improve 'Failed to create snapshot archive' warning message

(cherry picked from commit 5dcf348098)

runtime/src/snapshot_utils.rs

@@ -107,13 +107,13 @@ pub struct SlotSnapshotPaths {
 
 #[derive(Error, Debug)]
 pub enum SnapshotError {
-    #[error("I/O error")]
+    #[error("I/O error: {0}")]
     IO(#[from] std::io::Error),
 
-    #[error("serialization error")]
+    #[error("serialization error: {0}")]
     Serialize(#[from] bincode::Error),
 
-    #[error("file system error")]
+    #[error("file system error: {0}")]
     FsExtra(#[from] fs_extra::error::Error),
 
     #[error("archive generation failure {0}")]
@@ -122,7 +122,7 @@ pub enum SnapshotError {
     #[error("storage path symlink is invalid")]
     StoragePathSymlinkInvalid,
 
-    #[error("Unpack error")]
+    #[error("Unpack error: {0}")]
     UnpackError(#[from] UnpackError),
 }
 pub type Result<T> = std::result::Result<T, SnapshotError>;