README.md: Mention Custota as an alternative to the clearotacerts module #103

Job	Run time
Prepare workflow data	59s
Preload tox environments (py39)	1m 19s
Preload tox environments (py310)	59s
Preload tox environments (py311)	1m 47s
Preload device images (cheetah)	39s
Preload device images (bluejay)	40s
Preload device images (bramble)	45s
Preload device images (sunfish)	43s
Preload device images (ossi)	43s
Run test for cheetah with py39	2m 53s
Run test for cheetah with py310	2m 3s
Run test for cheetah with py311	2m 44s
Run test for bluejay with py39	2m 55s
Run test for bluejay with py310	2m 42s
Run test for bluejay with py311	2m 37s
Run test for bramble with py39	3m 2s
Run test for bramble with py310	2m 57s
Run test for bramble with py311	3m 33s
Run test for sunfish with py39	2m 10s
Run test for sunfish with py310	2m 12s
Run test for sunfish with py311	2m 14s
Run test for ossi with py39	5m 49s
Run test for ossi with py310	5m 17s
Run test for ossi with py311	6m 22s
	58m 4s

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