Add process pool initializer to manage-imports script

[jimchamp]

Fixes bug causing the importbot container to restart endlessly.

Prior to Python 14, the default multiprocessing start method in Linux environments was fork. Now, spawn is the default.

spawn creates a new Python interpreter process, which does not inherit the parent process's web.config. The web.config in spawned processes did not contain the necessary credentials for connecting to our DB, causing an unhandled error which stopped the container.

This code creates an initializer method which calls load_config when a new process is spawned. Now, new processes contain the necessary credentials, and the container no longer restarts ceaselessly.

Technical

Testing

Screenshot

Stakeholders

[Copilot]

Pull request overview

Fixes importbot restart loop under Python 3.14+ by ensuring child processes started via multiprocessing (now defaulting to spawn on Linux per PR description) load the Open Library config before running import work.

Changes:

• Add a multiprocessing.Pool worker initializer that calls load_config(configfile) in each spawned process.
• Thread the resolved configfile path through CLI flags into import_all() so the pool initializer can use it.

[cdrini]

Lgtm! Change makes sense, and @jimchamp tested that it works correctly on prod and fixes the restart issue. One optional non-blocking suggestion.

[mekarpeles]

Thank you!!!