irmin-pack: add gc cleanup for lower layer

mirage / irmin

Irmin is a distributed database that follows the same design principles as Git

https://irmin.org

ISC License

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irmin-pack: add gc cleanup for lower layer #2222

Closed metanivek closed 1 year ago

metanivek commented 1 year ago

This PR adds the cleanup code for the lower layer in the situation where GC fails, either in the worker or during finalization. I also did some light refactoring to co-locate the swap and cleanup functions in the Lower module.