Try explicit repo.

Author: OlgaMaciaszek

docker/spring-cloud-contract-stub-runner-docker/pom.xml

@@ -271,7 +271,7 @@
 					<username>${env.DOCKER_HUB_USERNAME}</username>
 					<password>${env.DOCKER_HUB_PASSWORD}</password>
 					<buildArgs>
-						<THIN_REPO>${thin.repo}</THIN_REPO>
+						<THIN_REPO>https://repo.spring.io/milestone</THIN_REPO>
 					</buildArgs>
 				</configuration>
 				<dependencies>