At Jenkins startup jenkins will extract all the .jpi files in the plugins folder, i.e. git.jpi is extracted to folder git.
As some of your folders are owned by root and only root has write permissions, jenkins is not able to modify those folders as jenkins is not running as root in your container
You can delete all the folders in the plugins directory outside of your container when jenkins is stopped. Then start again and it will most likely work.
You should check all files in /var/jenkins_home that they have the correct ownership (not root)