Release workflows: always check that the built dist is valid.

[dcherian]

Our release action failed :( https://github.com/pydata/xarray/actions/runs/15565419295/job/43828236592 Looks like something else was dragging in typing_extensions earlier.

[dcherian]

Actually I don't understand what happened here.

One action failed and another succeeeded: https://github.com/pydata/xarray/actions/workflows/pypi-release.yaml . the release is on pypi.

Does anyone understand what's going on?

[max-sixty]

hmmm, looks like the pipeline from the Release succeeded, the pipeline from the tag failed, so it successfully pushed to PyPI

it looks like that's because we don't run the verify check before the release?

[cgohlke]

Change:

from typing_extensions import Self

to

if TYPE_CHECKING:
    from typing_extensions import Self

at
https://github.com/pydata/xarray/blob/f1a2c08f21a8237c082913fcad2d77469448cf4c/xarray/core/accessor_dt.py#L8C1-L8C35

[sjperkins]

Apologies, I didn't see this PR before creating:

• Guard typing_extension import #10413

which guards the typing_extension import as done elsewhere in the code base.