Today, the installation script [1], perform a recursive permissions update under $JBOSS_HOME, this can take some while since there will be a lot of more files. The build time can be decreased if the permissions are updated only on the files changed by this script.

[1] - https://github.com/jboss-container-images/rhpam-7-image/blob/main/dashbuilder/modules/dashbuilder/install#L15