ENH: Add `py-rattler` #1385

Job	Run time
docs	35s
test (ubuntu-latest, 3.8, release)	12m 2s
test (ubuntu-latest, 3.12, release)	12m 48s
test_environments (ubuntu-latest, release)	2m 29s
test (ubuntu-latest, pypy-3.10, release)	16m 55s
test_environments (macos-latest, release)	2m 12s
test (macos-13, 3.8, release)	18m 38s
test (macos-13, 3.12, release)	18m 36s
test (macos-13, pypy-3.10, release)	18m 36s
	1h 42m 51s

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