add a barely working flux model #938

Job	Run time
build-docs	2m 1s
Build Wheel	12s
publish-docs	0s
lint	12s
test-gpu	6m 25s
test-non-gpu (3.10, ubuntu-latest)	1m 34s
type-check	2m 51s
test-non-gpu (3.11, ubuntu-latest)	1m 48s
Smoketest (Conda, Python 3.10, ubuntu-latest)	1m 42s
Smoketest (Python 3.10, ubuntu-latest)	1m 20s
Smoketest (Conda, Python 3.10, windows-latest)	2m 8s
Smoketest (Python 3.10, windows-latest)	1m 37s
Smoketest (Conda, Python 3.10, m2-16gb)	1m 46s
Smoketest (Python 3.10, m2-16gb)	29s
Smoketest (Conda, Python 3.11, ubuntu-latest)	2m 2s
Smoketest (Python 3.11, ubuntu-latest)	1m 35s
Smoketest (Conda, Python 3.11, windows-latest)	3m 42s
Smoketest (Python 3.11, windows-latest)	1m 8s
Smoketest (Conda, Python 3.11, m2-16gb)	1m 47s
Smoketest (Python 3.11, m2-16gb)	29s
	34m 48s

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