refer to image with multi-arch support

[matthewberryman]

The docker compose / k8s files all refer to an image without ARM support:

➜ docker pull ghcr.io/atuinsh/atuin:main
main: Pulling from atuinsh/atuin
no matching manifest for linux/arm64/v8 in the manifest list entries

This change refers to the image with ARM support, to enable usage on Linux arm64 and to improve performance on Apple Silicon machines.

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[ellie]

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