chore(ci): use Nix

[wmertens]

• use the same environment in dev and CI
• prep for caching installs and builds across PRs with Flakehub
• hopefully speeds up things even now

[changeset-bot]

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Latest commit: 16f9535

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@qwik.dev/core

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@qwik.dev/router

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eslint-plugin-qwik

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create-qwik

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@qwik.dev/optimizer

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commit: 16f9535

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