RANGER-5455: Refactor to use env variable RANGER_SCRIPTS

RANGER-5455: Move Kerberos related scripts to base image (#7)

RANGER-5381: add krb5-user package in ranger-base image (#5)

RANGER-5244: Add UBI base image with CI enabled in ubi branch (#3)

RANGER-5227: Add curl to the base image (#4)

RANGER-5158: Enable building ranger base images with CI in apache/ran…

…ger-tools

Co-authored-by: Abhishek Kumar <[email protected]>