exec/file: remove_file(): use --one-file-system when recursive is requested

exec/file.py

@@ -138,7 +138,7 @@ def remove_file(path: str, recursive=False):
         rm = rmtree if recursive else os.unlink
         rm(path)  # type: ignore
     except:
-        cmd = ['rm'] + (['-r'] if recursive else []) + [path]
+        cmd = ['rm', *(['-r', '--one-file-system'] if recursive else []), path]
         rc = run_root_cmd(cmd).returncode
         if rc:
             raise Exception(f"Unable to remove {path}: cmd returned {rc}")