ci: fix nightly and release

[kevinjqliu]

Rationale for this change

Follow up to #3193
env vars does not play nice with windows os (because the default shell is powershell). We need to set to bash so that env vars are interpreted correctly

Are these changes tested?

Yes
Ran on fork
nightly: https://github.com/kevinjqliu/iceberg-python/actions/runs/23805622644
release: https://github.com/kevinjqliu/iceberg-python/actions/runs/23805619712

Are there any user-facing changes?

[geruh]

non blocking: do we need to go and update the svn-build-artifacts.yml since it uses windows-latest.

[geruh]

nice add!

[kevinjqliu]

non blocking: do we need to go and update the svn-build-artifacts.yml since it uses windows-latest.

nope i dont think so, the only env: block in that file is for uses: pypa/cibuildwheel, not run: like the others

iceberg-python/.github/workflows/svn-build-artifacts.yml

Lines 69 to 77 in f4d475e

	env:
	# Ignore 32 bit architectures
	CIBW_ARCHS: "auto64"
	CIBW_PROJECT_REQUIRES_PYTHON: ">=3.10,<3.14"
	CIBW_BEFORE_TEST: "uv sync --directory {project} --only-group dev --no-install-project"
	CIBW_TEST_COMMAND: "uv run --directory {project} pytest tests/avro/test_decoder.py"
	# Skip free-threaded (PEP 703) builds until we evaluate decoder_fast support
	CIBW_SKIP: "cp3*t-*"

[kevinjqliu]

nice! nightly is back https://github.com/apache/iceberg-python/actions/runs/23810165138

thanks for the review!