Add workflow_dispatch trigger to GitHub Actions CI (#9) #21

Job	Run time
pytest / setup	3s
pytest / setup	5s
pytest / pytest (macos-latest, 3.8)	51s
pytest / pytest (macos-latest, 3.8)	1m 4s
pytest / pytest (macos-latest, 3.9)	39s
pytest / pytest (macos-latest, 3.9)	55s
pytest / pytest (macos-latest, 3.10)	37s
pytest / pytest (macos-latest, 3.10)	38s
pytest / pytest (macos-latest, 3.11)	31s
pytest / pytest (macos-latest, 3.11)	40s
pytest / pytest (macos-latest, 3.12)	44s
pytest / pytest (macos-latest, 3.12)	33s
pytest / pytest (ubuntu-latest, 3.8)	54s
pytest / pytest (ubuntu-latest, 3.9)	51s
pytest / pytest (ubuntu-latest, 3.10)	45s
pytest / pytest (ubuntu-latest, 3.11)	41s
pytest / pytest (ubuntu-latest, 3.12)	49s
pytest / pytest (windows-latest, 3.8)	51s
pytest / pytest (windows-latest, 3.8)	1m 18s
pytest / pytest (windows-latest, 3.9)	51s
pytest / pytest (windows-latest, 3.9)	1m 35s
pytest / pytest (windows-latest, 3.10)	52s
pytest / pytest (windows-latest, 3.10)	1m 36s
pytest / pytest (windows-latest, 3.11)	50s
pytest / pytest (windows-latest, 3.11)	1m 56s
pytest / pytest (windows-latest, 3.12)	50s
pytest / pytest (windows-latest, 3.12)	1m 38s
pytest / pytest (ubuntu-20.04, 3.6)	33s
pytest / pytest (ubuntu-20.04, 3.6)	39s
pytest / pytest (ubuntu-22.04, 3.8)	1m 5s
pytest / pytest (ubuntu-22.04, 3.9)	1m 28s
pytest / pytest (ubuntu-22.04, 3.10)	1m 44s
pytest / pytest (ubuntu-22.04, 3.11)	1m 10s
pytest / pytest (ubuntu-22.04, 3.12)	1m 26s
	31m 42s

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