Updating cert-manager instructions #1708

Job	Run time
govet (1.21.x, ubuntu-latest)	2m 56s
lint (1.21.x, ubuntu-latest)	5m 13s
Shellcheck (1.21.x)	33s
Check for vulnerable dependencies (1.21.x)	47s
gotest (1.21.x, ubuntu-latest)	3m 23s
operator (1.21.x, ubuntu-latest)	6m 10s
test-tenant (1.21.x, ubuntu-latest)	3m 14s
test-kes (1.21.x, ubuntu-latest)	4m 55s
helm-floor (1.21.x, ubuntu-latest)	3m 52s
helm (1.21.x, ubuntu-latest)	3m 1s
test-policy-binding (1.21.x, ubuntu-latest)	10m 55s
test-tenant-upgrade (1.21.x, ubuntu-latest)	4m 45s
	49m 44s

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