add a barely working flux model #939

Job	Run time
publish-docs	0s
Build Wheel	11s
lint	14s
test-gpu	11m 0s
type-check	2m 55s
test-non-gpu (3.10, ubuntu-latest)	1m 35s
test-non-gpu (3.11, ubuntu-latest)	1m 42s
Smoketest (Conda, Python 3.10, ubuntu-latest)	1m 55s
Smoketest (Python 3.10, ubuntu-latest)	1m 24s
Smoketest (Conda, Python 3.10, windows-latest)	2m 25s
Smoketest (Python 3.10, windows-latest)	1m 15s
Smoketest (Conda, Python 3.10, m2-16gb)	1m 46s
Smoketest (Python 3.10, m2-16gb)	30s
Smoketest (Conda, Python 3.11, ubuntu-latest)	1m 31s
Smoketest (Python 3.11, ubuntu-latest)	1m 30s
Smoketest (Conda, Python 3.11, windows-latest)	2m 2s
Smoketest (Python 3.11, windows-latest)	1m 52s
Smoketest (Conda, Python 3.11, m2-16gb)	1m 48s
Smoketest (Python 3.11, m2-16gb)	27s
	36m 2s

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