feat: Add pixi to the template #1249

Job	Run time
linter	1m 32s
smoke-test (auto-format-tools.sh)	2m 36s
check-branch	22s
smoke-test (automation.sh)	2m 32s
smoke-test (build-systems.sh)	8m 32s
smoke-test (cli.sh)	2m 32s
smoke-test (docs-jupyter-book.sh)	2m 56s
smoke-test (containers.sh)	2m 58s
smoke-test (docs-mkdocs.sh)	3m 49s
smoke-test (docs-quarto.sh)	4m 16s
smoke-test (files.sh)	6m 58s
smoke-test (docs-sphinx.sh)	4m 7s
smoke-test (linters.sh)	8m 48s
smoke-test (tests.sh)	2m 28s
smoke-test (virtual-envs.sh)	2m 58s
tests (macos)	1m 51s
tests (ubuntu)	1m 19s
tests (windows)	4m 30s
	1h 5m 4s

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