feat: add API_EXTERNAL_URL #201

Job	Run time
modified-files	5s
validate-chart-version / validate-chart-version	5s
helm-integration / integration-helm	22m 31s
docker-unit / unit-compose	2m 28s
docker-unit / integration-compose-internal	5m 18s
docker-unit / integration-compose-legacy	5m 26s
helm-unit / unit-helm	4m 47s
all-tests	4s
helm-pre-release / pre-release	32s
	41m 16s

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