ENH: Update docker and binder

[oesteban]

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[chatgpt-codex-connector]

💡 Codex Review

nipreps-book/binder/postBuild

Lines 1 to 7 in 9388b02

	#!/bin/bash
	set -euxo pipefail
	curl -fsSL https://pixi.sh/install.sh | bash
	export PATH="$HOME/.pixi/bin:$PATH"
	pixi install --locked

Activate pixi env for Binder kernel

The Binder setup now leaves binder/requirements.txt empty while postBuild merely installs a pixi environment (curl …; pixi install --locked). Binder launches Jupyter in the base Python environment, so none of the packages installed into .pixi will be available unless the kernel is switched to run through pixi. As written, notebooks will still run in an environment missing the repo’s dependencies and imports will fail. The build needs to activate the pixi environment for the default kernel (for example, by injecting the shell hook and registering the environment) or continue installing packages via requirements.txt.

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