Add property for optional runner #819

Job	Run time
linters (3.9, ubuntu-latest)	43s
Testing on Python 3.8 (ubuntu-latest)	49s
Testing on Python 3.8 (macos-13)	1m 17s
Testing on Python 3.8 (windows-2019)	2m 34s
Testing on Python 3.9 (ubuntu-latest)	59s
Testing on Python 3.9 (macos-13)	1m 11s
Testing on Python 3.9 (windows-2019)	2m 13s
Testing on Python 3.10 (ubuntu-latest)	53s
Testing on Python 3.10 (macos-13)	1m 19s
Testing on Python 3.10 (windows-2019)	2m 32s
Testing on Python 3.11 (ubuntu-latest)	47s
Testing on Python 3.11 (macos-13)	1m 30s
Testing on Python 3.11 (windows-2019)	2m 32s
	19m 19s

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