Fix attachments build

[rkistner]

Fix build regression from #753.

This caused prod builds (package releases) to hang on the build step. Weirdly, it doesn't happen when running pnpm build:prod directly in the attachments package, but does happen when running the global pnpm build:packages:prod.

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Latest commit: 471ec03

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[simolus3]

Ouch, sorry for that and thanks for adding the :prod step to catch this in the future 👍