Externalize build properties.

See #2074.

Author: gregturn

Diff for: ci/pipeline.properties

@@ -1,8 +1,6 @@
 # Java versions
-java.main.tag=17.0.1_12-jdk
-#java.next.tag=11.0.13_8-jdk
-#java.lts.tag=17.0.1_12-jdk
-#
+java.main.tag=17.0.2_8-jdk
+
 # Docker container images - standard
 docker.java.main.image=harbor-repo.vmware.com/dockerhub-proxy-cache/library/eclipse-temurin:${java.main.tag}
 docker.java.next.image=harbor-repo.vmware.com/dockerhub-proxy-cache/library/eclipse-temurin:${java.next.tag}