Externalize build properties.

See #2541.

ci/pipeline.properties

@@ -0,0 +1,24 @@
+# Java versions
+java.main.tag=8u312-b07-jdk
+java.11.tag=11.0.13_8-jdk
+java.15.tag=15.0.2_7-jdk-hotspot
+
+# Docker container images - standard
+docker.java.main.image=eclipse-temurin:${java.main.tag}
+docker.java.11.image=eclipse-temurin:${java.11.tag}
+docker.java.15.image=adoptopenjdk:${java.15.tag}
+
+# Supported versions of MongoDB
+docker.mongodb.4.0.version=4.0.23
+docker.mongodb.4.4.version=4.4.4
+docker.mongodb.5.0.version=5.0.3
+
+# Supported versions of Redis
+docker.redis.6.version=6.2.4
+
+# Supported versions of Cassandra
+docker.cassandra.3.version=3.11.10
+
+# Docker environment settings
+docker.java.inside.basic=-v $HOME:/tmp/jenkins-home
+docker.java.inside.docker=-u root -v /var/run/docker.sock:/var/run/docker.sock -v /usr/bin/docker:/usr/bin/docker -v $HOME:/tmp/jenkins-home