Set package-manager

[xuanxu]

This PR adds a configuration value needed by the latest version of the Astro build. This change should fix this error.

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Name	Status	Preview	Updated (UTC)
unitary-fund-prel	✅ Ready (Inspect)	Visit Preview	Oct 31, 2023 8:41pm

[nathanshammah]

@xuanxu it seems to have worked!

[xuanxu]

Yay! 🎉