Use Docker in Docker setup for CI.

See #217

Author: mp911de

Jenkinsfile

@@ -41,7 +41,7 @@ pipeline {
 					docker.withRegistry(p['docker.proxy.registry'], p['docker.proxy.credentials']) {
 						docker.image(p['docker.java.main.image']).inside(p['docker.java.inside.basic']) {
 							sh 'MAVEN_OPTS="-Duser.name=' + "${p['jenkins.user.name']}" + ' -Duser.home=/tmp/jenkins-home" ' +
-								"./mvnw -s settings.xml -Pwith-bom-client verify -B -U"
+								"./mvnw -s settings.xml -Dmaven.repo.local=/tmp/jenkins-home/.m2/spring-data-bom -Ddevelocity.storage.directory=/tmp/jenkins-home/.develocity-root -Pwith-bom-client verify -B -U"
 						}
 					}
 				}
@@ -68,15 +68,17 @@ pipeline {
 			steps {
 				script {
 					docker.withRegistry(p['docker.proxy.registry'], p['docker.proxy.credentials']) {
-						docker.image(p['docker.java.main.image']).inside(p['docker.java.inside.basic']) {
+						docker.image(p['docker.java.main.image']).inside(p['docker.java.inside.docker']) {
 							sh 'MAVEN_OPTS="-Duser.name=' + "${p['jenkins.user.name']}" + ' -Duser.home=/tmp/jenkins-home" ' +
 									"./mvnw -s settings.xml -Pci,artifactory " +
+									"-Ddevelocity.storage.directory=/tmp/jenkins-home/.develocity-root " +
 									"-Dartifactory.server=${p['artifactory.url']} " +
 									"-Dartifactory.username=${ARTIFACTORY_USR} " +
 									"-Dartifactory.password=${ARTIFACTORY_PSW} " +
 									"-Dartifactory.staging-repository=${p['artifactory.repository.snapshot']} " +
 									"-Dartifactory.build-name=spring-data-bom " +
 									"-Dartifactory.build-number=spring-data-bom-${BRANCH_NAME}-build-${BUILD_NUMBER} " +
+									"-Dmaven.repo.local=/tmp/jenkins-home/.m2/spring-data-bom " +
 									"-Dmaven.test.skip=true clean deploy -U -B"
 						}
 					}