add .with_read_only

Author: TomNicholas

src/zarr/storage/_zip.py

@@ -90,6 +90,16 @@ def __init__(
         self.compression = compression
         self.allowZip64 = allowZip64
 
+    def with_read_only(self, read_only: bool = False) -> ZipStore:
+        # docstring inherited
+        return type(self)(
+            path=self.path,
+            mode='r',
+            read_only=read_only,
+            compression=self.compression,
+            allowZip64=self.allowZip64,
+        )
+
     def _sync_open(self) -> None:
         if self._is_open:
             raise ValueError("store is already open")