feat(image-builder): Add mechanism to pass api server env vars to kaniko build jobs #2216

Job	Run time
build-test-experiment-engine-plugin	37s
build-api	1m 56s
build-router	1m 5s
build-cluster-init	15s
build-ui	2m 6s
release-rules	2s
test-engines-experiment	35s
test-engines-router	1m 16s
test-api	1m 40s
test-e2e (In-cluster credentials; API e2e)	11m 49s
test-e2e (Remote cluster credentials; SDK e2e)	13m 9s
publish	0s
	34m 30s

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