Add API to get domain #3806

Job	Run time
test-bootstrap	17s
test-bootstrap	17s
test-bootstrap	17s
test-bootstrap	17s
build-and-push-single-binary-image	4m 59s
build-and-push-single-binary-image	4m 59s
build-and-push-single-binary-image	4m 59s
build-and-push-single-binary-image	4m 59s
sandbox-bundled-functional-tests	4m 57s
sandbox-bundled-functional-tests	5m 16s
sandbox-bundled-functional-tests	5m 6s
sandbox-bundled-functional-tests	5m 28s
build-and-push-sandbox-bundled-image	0s
build-and-push-sandbox-bundled-image	0s
build-and-push-sandbox-bundled-image	0s
build-and-push-sandbox-bundled-image	0s
	41m 51s

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