add a barely working flux model #941

Job	Run time
test-gpu	4m 27s
publish-docs	0s
lint	12s
Build Wheel	20s
test-non-gpu (3.10, ubuntu-latest)	1m 44s
type-check	4m 10s
test-non-gpu (3.11, ubuntu-latest)	1m 45s
Smoketest (Python 3.10, ubuntu-latest)	1m 27s
Smoketest (Conda, Python 3.10, ubuntu-latest)	1m 44s
Smoketest (Python 3.10, windows-latest)	1m 17s
Smoketest (Conda, Python 3.10, windows-latest)	2m 56s
Smoketest (Python 3.10, m2-16gb)	32s
Smoketest (Conda, Python 3.10, m2-16gb)	1m 55s
Smoketest (Python 3.11, ubuntu-latest)	1m 28s
Smoketest (Conda, Python 3.11, ubuntu-latest)	1m 37s
Smoketest (Python 3.11, windows-latest)	1m 27s
Smoketest (Conda, Python 3.11, windows-latest)	2m 41s
Smoketest (Python 3.11, m2-16gb)	32s
Smoketest (Conda, Python 3.11, m2-16gb)	35s
	30m 49s

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