CI for deploying custom python block modal app

[grzegorz-roboflow]

What does this PR do?

CI for deploying custom python block modal app

Type of Change

Automate deployment of custom python block modal

Testing

manually tested

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have updated the documentation accordingly (if applicable)

Additional Context

N/A

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Note

Automates deployment of the custom Python Block Modal app and adds version pinning for the inference image.

• New GitHub Actions workflow modal.custom_python_block.deploy.yml triggers on successful "Publish Wheels to PyPi" or manual dispatch; sets up Python 3.12, installs modal, and runs modal/deploy_modal_app.py with required secrets and optional inference_version input
• modal_app.py now reads INFERENCE_VERSION env var to pin inference package in get_inference_image() (fallback to package __version__ or latest); minor import adjustment to support this

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