test: add permissions to extracted test directory

The hope is this will prevent the permission errors in the
  OCaml tests

.drone.yml

@@ -70,6 +70,7 @@ steps:
   - name: ocaml_tests
     image: ocaml/opam
     commands:
+      - ls -als tests/extracted
       - bin/run_tests ocaml ml
 
 volumes:

bin/extract_tests.xsh

@@ -19,6 +19,7 @@ EXP = 'expect'
 for path in TEST_LIST:
   destdir = pf"{DESTINATION}/{path.stem}"
   mkdir -p @(destdir)
+  chmod ugo+rwx @(destdir)
   contents = path.read_text()
   tests = re.split(r'test\s*(.+?)\s*\[\[.*?\n', contents)[1:]
   testit = iter(tests)