feat: Add pixi to the template #1304

Job	Run time
linter	1m 16s
smoke-test (auto-format-tools.sh)	1m 46s
check-branch	5s
smoke-test (automation.sh)	2m 10s
smoke-test (build-systems.sh)	7m 20s
smoke-test (cli.sh)	2m 11s
smoke-test (docs-jupyter-book.sh)	2m 48s
smoke-test (containers.sh)	2m 42s
smoke-test (docs-mkdocs.sh)	3m 26s
smoke-test (docs-quarto.sh)	4m 4s
smoke-test (docs-sphinx.sh)	3m 50s
smoke-test (files.sh)	5m 49s
smoke-test (linters.sh)	7m 19s
smoke-test (tests.sh)	2m 7s
tests (macos)	2m 33s
smoke-test (virtual-envs.sh)	1m 47s
tests (ubuntu)	2m 0s
tests (windows)	4m 2s
	57m 15s

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