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The intent on rebuilding buildContainerEnvironment is to let buildwrappers introduce additional environment variables into the container, so can't be cached in BuiltInContainer as suggested.

Thank you for your answer.
So It's another way to not given all env variables (like JAVA_HOME, PATH) into the container? Add a list in a parameter of the plugin in the job ? Or global master list?

yes, letting Jenkins component inject environment variable but keeping isolation from host executor is not trivial. Using a whitelist would just be a crappy workaround, I'm looking at a global fix

ok thank you for keeping that problem in mind, if I can help, tell me

I'm being affected by this issue too. My build job runs the following docker exec command:

docker exec --tty 875fb3f6e0d2f807ee686a45cd7ca454b3e2d21267e69f4904dfc47ee4e4f36a env
[build-java] $ docker exec --tty --user 996:994 875fb3f6e0d2f807ee686a45cd7ca454b3e2d21267e69f4904dfc47ee4e4f36a env BUILD_DISPLAY_NAME=#48 BUILD_ID=48 BUILD_NUMBER=48 BUILD_TAG=jenkins-build-java-48 BUILD_URL=http://167.114.5.144:8080/job/build-java/48/ CLASSPATH= EXECUTOR_NUMBER=1 GIT_BRANCH=origin/develop GIT_COMMIT=ac25cd160339bc918454bdf03b8536e3bad38bd9 GIT_PREVIOUS_COMMIT=ac25cd160339bc918454bdf03b8536e3bad38bd9 GIT_PREVIOUS_SUCCESSFUL_COMMIT=7627d61db1210a0c0e782b3f3b8d738dc09c3cca GIT_URL=git@github.com:truetrademarkets/build-java.git HOME=/root HOSTNAME=875fb3f6e0d2 HUDSON_HOME=/var/lib/jenkins HUDSON_SERVER_COOKIE=9cace0193314c24d HUDSON_URL=http://167.114.5.144:8080/ JENKINS_HOME=/var/lib/jenkins JENKINS_SERVER_COOKIE=9cace0193314c24d JENKINS_URL=http://167.114.5.144:8080/ JOB_BASE_NAME=build-java JOB_NAME=build-java JOB_URL=http://167.114.5.144:8080/job/build-java/ NODE_LABELS=master NODE_NAME=master PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin TERM=xterm WORKSPACE=/var/lib/jenkins/workspace/build-java /var/lib/jenkins/workspace/build-java/gradlew -g /var/lib/jenkins/jenkins-build-java-48 --console=plain --debug clean build

Note the parts in Bold are conflicting - why is the plugin setting $HOME variable to /root
This build command will be executed as user 996 (jenkins user) inside the container.