feat: Add pixi to the template #1314

Job	Run time
check-branch	4s
linter	1m 20s
smoke-test (auto-format-tools.sh)	1m 43s
smoke-test (automation.sh)	2m 6s
smoke-test (cli.sh)	2m 9s
smoke-test (build-systems.sh)	7m 6s
smoke-test (containers.sh)	2m 34s
smoke-test (docs-jupyter-book.sh)	2m 45s
smoke-test (docs-quarto.sh)	3m 42s
smoke-test (docs-mkdocs.sh)	3m 8s
smoke-test (docs-sphinx.sh)	3m 25s
smoke-test (files.sh)	5m 56s
smoke-test (linters.sh)	7m 24s
smoke-test (tests.sh)	2m 7s
smoke-test (virtual-envs.sh)	1m 43s
tests (macos)	2m 9s
tests (ubuntu)	1m 21s
tests (windows)	5m 56s
	56m 38s

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