python-version-file does not support multiple versions

[astro-stan]

Description:
It is possible to specify multiple python versions like so:

- uses: actions/setup-python@v5
  with:
    python-version: |
      3.8
      3.9
      3.10

However, specifying them like so breaks CI:

.python-version:

3.8
3.9
3.10

- uses: actions/setup-python@v5
   with:
     python-version-file: '.python-version'

Action version:
5

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:

Repro steps:
See description

Expected behavior:
Multiple python versions can be read from .python-version

Actual behavior:
Multiple python versions cannot be read from .python-version

[aparnajyothi-y]

Hello @sdimovv, Thank you for creating this issue and we will look into it :)

[aparnajyothi-y]

Hello @sdimovv, Thank you once again for creating this issue and as per the current implementation, the actions/setup-python action does not support reading multiple Python versions from a .python-version file. Instead, we should specify multiple versions directly in the yaml configuration under the python-version parameter like below as per this documentation.

• uses: actions/setup-python@v5
  with:
  python-version: |
  3.8
  3.9
  3.10

  Adding support to list multiple versions from a python-version-file that is expecting from this issue can be implemented as a feature request.