A new hire’s laptop runs a UCS inventory script fine, but the CI co…

Question

A new hire’s laptop runs a UCS inventory script fine, but the CI container fails importing the same modules. Which 12-factor dependency practice prevents that class of failure?

Accepted Answer

Declare packages in a requirements or lock file and install that isolated set in the container. — Declared dependencies are a packing list—everyone loads the same crate. ‘Works on my laptop’ implicit packages leave the CI container missing modules the developer never wrote down.

Answer

Assume the base OS image already has every Python package the developer’s laptop uses.

Answer

Skip dependency files and document ‘pip packages as needed’ only in a wiki paragraph.

Answer

Vendor nothing and rely on apt packages that differ between Ubuntu laptops and Alpine builders.

A new hire’s laptop runs a UCS inventory script fine, but the CI container fails importing the same modules. Which 12-factor dependency practice prevents that class of failure?

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