Configure Mend for GitHub.com #889

Job	Run time
spec (ruby 2.7) / spec	48s
spec (ruby 3.2) / spec	44s
acceptance (ruby 2.7 \| windows-2019) / acceptance	29m 31s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	12m 37s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	12m 31s
acceptance (ruby 3.2 \| windows-2019) / acceptance	33m 7s
	1h 29m 18s

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