feat: add env for default operator image #1744

Job	Run time
lint (1.21.x, ubuntu-latest)	4m 58s
govet (1.21.x, ubuntu-latest)	1m 37s
Shellcheck (1.21.x)	29s
Check for vulnerable dependencies (1.21.x)	1m 15s
gotest (1.21.x, ubuntu-latest)	1m 56s
operator (1.21.x, ubuntu-latest)	5m 59s
test-cert-manager (1.21.x, ubuntu-latest)	4m 11s
helm (1.21.x, ubuntu-latest)	3m 11s
helm-floor (1.21.x, ubuntu-latest)	2m 32s
test-kes (1.21.x, ubuntu-latest)	4m 20s
test-tenant-upgrade (1.21.x, ubuntu-latest)	4m 17s
test-policy-binding (1.21.x, ubuntu-latest)	15m 22s
test-tenant (1.21.x, ubuntu-latest)	3m 18s
	53m 25s

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