macOS app throws "library load disallowed by system policy" error while loading 3rd-party Python .so modules

[FeodorFitsner]

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Describe the bug

Original report: #4514 (comment)

I got this error when I release it to test flight and test on my mac M4:

  File "/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/__init__.py", line 6, in <module>
    from ._pydantic_core import (
ImportError: dlopen(/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/_pydantic_core.cpython-312-darwin.so, 0x0002): tried: '/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/_pydantic_core.cpython-312-darwin.so' (code signature in <17D6EF5C-4D71-3E06-912D-5464BC98FC00> '/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/_pydantic_core.cpython-312-darwin.so' not valid for use in process: library load disallowed by system policy), '/System/Volumes/Preboot/Cryptexes/OS/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/_pydantic_core.cpython-312-darwin.so' (no such file), '/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/_pydantic_core.cpython-312-darwin.so' (code signature in <17D6EF5C-4D71-3E06-912D-5464BC98FC00> '/Users/simon/Library/Containers/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/Data/Library/Application Support/com.diogenes.ai.chatbot.flet.diogenesaibutlerflet/flet/app/__pypackages__/pydantic_core/_pydantic_core.cpython-312-darwin.so' not valid for use in process: library load disallowed by system policy)

Code sample

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# n/a

To reproduce

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Expected behavior

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Operating System

macOS

Operating system details

Any version

Flet version

0.25.1

Regression

No, it isn't

Suggestions

No response

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Additional details

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[dsx1986]

I do build with entitlements: flet build macos --info-plist LSApplicationCategoryType="public.app-category.productivity" --macos-entitlements com.apple.security.app-sandbox=True --build-number $(date +%y%m%d%H%M)

[FeodorFitsner]

OK, as it's sandbox my guess would be #2 from here: " it could be a problem with signing 3rd-party python packages (like pydantic) unpacked during the first run."

Will investigate.

[FeodorFitsner]

Note to developers: https://docs.flutter.dev/deployment/macos