doc: mention containerd requirement (#694) #1573

Job	Run time
matrix-prep-bazelversion	5s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	2m 28s
test (ubuntu-latest, 7.1.1, ., false)	5m 36s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 16s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	19s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 27s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	4m 42s
test (ubuntu-latest, 6.4.0, ., true)	1m 27s
test (ubuntu-latest, 6.4.0, ., false)	5m 46s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	2m 48s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	18s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 31s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	4m 57s
test (macos-13, 7.1.1, ., true)	7m 7s
test (macos-13, 7.1.1, ., false)	9m 12s
test (macos-13, 7.1.1, e2e/smoke, true)	55s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 55s
	57m 50s

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