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Test the runner images in a dedicated `runner-images` PR check #11826

Job	Run time
Split workflow (macos-26, linked)	1m 35s
Split workflow (ubuntu-26.04, default)	1m 17s
Split workflow (macos-26, default)	1m 53s
Split workflow (macos-26, nightly-latest)	1m 44s
Split workflow (ubuntu-26.04, nightly-latest)	57s
Split workflow (ubuntu-26.04, linked)	1m 11s
	8m 37s