Restore ci properties.

Restore recently dropped ci properties.

Author: christophstrobl

ci/pipeline.properties

@@ -26,3 +26,5 @@ docker.java.inside.docker=-u root -v /var/run/docker.sock:/var/run/docker.sock -
 docker.registry=
 docker.credentials=hub.docker.com-springbuildmaster
 artifactory.credentials=02bd1690-b54f-4c9f-819d-a77cb7a9822c
+gradle-enterprise-cache.credentials=gradle_enterprise_cache_user
+gradle-enterprise.access-key=gradle_enterprise_secret_access_key