Create oracle database docker container for raspberry pi 4 (arm64)

I hope I’m in the correct forum.
I desperately try to create an docker image with an oracle database that runs on my raspberry pi.
There are some resources in the web with an step by step guide how one can manage this. (for example: https://www.database-blog.at/2023/06/28/oracle-19c-fuer-linux-arm-ist-da/)

I successfully create an Dockerfile with an base setup like this:

FROM arm64v8/oraclelinux:9
RUN dnf -y update
RUN yum install -y oracle-database-preinstall-19c.aarch64
RUN mkdir -p /u01/app/oracle
RUN chown -r oracle:oinstall /u01/app
...
CMD ["/bin/bash"]

The problem is that the installation of oracle-database-preinstall-19c.aarch64 fails with the error message: No match for argument: oracle-database-preinstall-19c.aarch64

When I try to search for it with yum search -y oracle-database-preinstall-19c.aarch64 i just get the error:

Oracle Linux 9 EPEL Packages for Development (aarch64)      1.8 MB/s |  58 MB     00:32    
Oracle Linux 9 BaseOS Latest (aarch64)                      1.7 MB/s |  35 MB     00:19    
Oracle Linux 9 Application Stream Packages (aarch64)        1.8 MB/s |  20 MB     00:11    
Last metadata expiration check: 0:00:21 ago on Sat Apr 20 08:30:05 2024.
No matches found.

So I have no idea what Im doing wrong. Is there a special repo I have to include to install the needed package? Is the packet not hosted anymore? Or is is just not possible to create an docker image with an oracle database for an arm/aarch architecture?

Any help is appreciated.

UPDATE

I think I got it. It seems that I have to add the repo with yum-config-manager. In my case (ol8) it was: yum-config-manager --add-repo https://yum.oracle.com/repo/OracleLinux/OL8/baseos/latest/aarch64.
After this, dnf -y install oracle-database-preinstall-19c seems to work.