ci: fix nightly and release (#3215)
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# 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?
<!-- In the case of user-facing changes, please add the changelog label.
-->PyIceberg is a Python library for programmatic access to Iceberg table metadata as well as to table data in Iceberg format. It is a Python implementation of the Iceberg table spec.
The documentation is available at https://py.iceberg.apache.org/.