feat: Add pixi to the template #1248

Job	Run time
check-branch	5s
linter	1m 23s
smoke-test (auto-format-tools.sh)	1m 57s
smoke-test (automation.sh)	2m 28s
smoke-test (build-systems.sh)	8m 37s
smoke-test (cli.sh)	2m 23s
smoke-test (containers.sh)	3m 1s
smoke-test (docs-jupyter-book.sh)	2m 58s
smoke-test (docs-mkdocs.sh)	3m 27s
smoke-test (docs-quarto.sh)	4m 10s
smoke-test (docs-sphinx.sh)	4m 12s
smoke-test (files.sh)	6m 44s
smoke-test (linters.sh)	8m 51s
smoke-test (tests.sh)	2m 30s
smoke-test (virtual-envs.sh)	1m 48s
tests (macos)	2m 0s
tests (ubuntu)	1m 21s
tests (windows)	6m 21s
	1h 4m 16s

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