use cache for Jenkins remote files

[morlajb]

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we have a heavy Jenkins with more than 10,000 runs a day. it would be nice to try and reduce some loads from it :

currently it checkout every branch build

Checking out git https://github.com/XXXX/jenkins-files.git into /var/jenkins_home/workspace/aaa_main@script/23af8263fcd014953cdff9bf6785fd52eb5b74f67310a854c0195f1b4d89dd8a to read Jenkinsfiles/aaa/Jenkinsfile

instead of doing the checkout over and over maybe we can use some cache , like in the jenkins-lib mechanism

Loading library jenkins@main
Library jenkins@main is cached. Copying from home.

another issue , is missing of cleanup , those remote files stay forever , need to add a weekly / daily cleanup