CI: adding workflow dispatch #191

Job	Run time
tests / Load tox environments	4s
tests / codestyle (ubuntu-latest)	13s
tests / py37-test-pytestoldest (ubuntu-latest)	43s
tests / py37-test-pytest50 (macos-12)	1m 26s
tests / py38-test-pytest52 (windows-latest)	1m 24s
tests / py38-test-pytest53 (ubuntu-latest)	38s
tests / py39-test-pytest60 (macos-12)	1m 13s
tests / py39-test-pytest61 (windows-latest)	1m 28s
tests / py310-test-pytest62 (ubuntu-latest)	43s
tests / py310-test-pytest70 (macos-latest)	40s
tests / py310-test-pytest71 (windows-latest)	1m 36s
tests / py311-test-pytest72 (ubuntu-latest)	50s
tests / py311-test-pytest73 (macos-latest)	37s
tests / py312-test-pytest74 (windows-latest)	1m 35s
tests / py312-test-devdeps (ubuntu-latest)	1m 5s
publish / Build source and wheel distribution	1m 27s
	15m 42s

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