ci: test all the ubuntu node version/combos #283

Job	Run time
test (ubuntu-latest, amd64, false, false, 16)	50s
test (ubuntu-latest, arm64, false, true, 16)	12m 44s
test (ubuntu-latest, arm64, true, true, 16)	6m 43s
test (ubuntu-latest, amd64, true, true, 16)	1m 15s
test (ubuntu-latest, amd64, false, false, 18)	43s
test (ubuntu-latest, arm64, false, true, 18)	6m 38s
test (ubuntu-latest, arm64, true, true, 18)	6m 16s
test (ubuntu-latest, amd64, true, true, 18)	57s
test (ubuntu-latest, amd64, false, false, 20)	46s
test (ubuntu-latest, arm64, false, true, 20)	4m 52s
test (ubuntu-latest, arm64, true, true, 20)	4m 55s
test (ubuntu-latest, amd64, true, true, 20)	1m 0s
	47m 39s

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