In the section Installing 3scale with the operator using Oracle as the system database there is a link in "Download 3scale OpenShift templates from the GitHub repository... " pointing to 2.11 version https://github.com/3scale/3scale-amp-openshift-templates/archive/refs/tags/3scale-2.11.1-GA.tar.gz

This should be updated to 2.12. The link that is currently available in the repo is: https://github.com/3scale/3scale-amp-openshift-templates/archive/refs/tags/3scale-2.12.0-GA.tar.gz

This means that the following needs to be changed also:

tar -xzf 3scale-amp-openshift-templates-3scale-2.12-GA.tar.gz
to
tar -xzf 3scale-2.12.0-GA.tar.gz

3scale-amp-openshift-templates-3scale-2.12-GA/amp/system-oracle/oracle-client-files
to
3scale-amp-openshift-templates-3scale-2.12.0-GA/amp/system-oracle/oracle-client-files (missing patch version .0 in the directory name)