Tests

Add --processes parameter to automatically fork worker processes #2262

Job	Run time
flake8	16s
lint_typecheck_webui	1m 1s
black	17s
Always - Docker verify, push to tag 'master' if on master	0s
mypy	21s
fail_fast_test_main	2m 32s
3.12	7m 0s
3.11	7m 2s
3.10	6m 54s
3.9	7m 6s
3.8	7m 0s
PyPI - Publish prerelease on merge commit on master	0s
PyPI - Publish if this is a tagged commit	0s
Tagged - Docker push to tag based on git tag. Also push 'latest' if on master	0s
	39m 29s

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