Filter out doctest warning (#8539)

* Filter out doctest warning

Trying to fix #8537. Not sure it'll work and can't test locally so seeing if it passes CI

* try using the CLI to ignore the warning

---------

Co-authored-by: Justus Magin <keewis@posteo.de>

.github/workflows/ci-additional.yaml

@@ -76,7 +76,11 @@ jobs:
           # Raise an error if there are warnings in the doctests, with `-Werror`.
           # This is a trial; if it presents an problem, feel free to remove.
           # See https://github.com/pydata/xarray/issues/7164 for more info.
-          python -m pytest --doctest-modules xarray --ignore xarray/tests -Werror
+
+          # ignores:
+          # 1. h5py: see https://github.com/pydata/xarray/issues/8537
+          python -m pytest --doctest-modules xarray --ignore xarray/tests -Werror \
+              -W "ignore:h5py is running against HDF5 1.14.3:UserWarning"
 
   mypy:
     name: Mypy