Hezner launched Arm64 based servers a little while back. You get more CPU and more memory for your money.
Will the open Source CMS with docker work on this platform?
Ubuntu 22.04 LTS, 8 cores, 16 GB RAM
We don’t release multi-arch images of our docker container, so the released containers won’t work.
Whether it can be made to work or not, I am not sure 
All of the component parts do seem to have support for ARM (php, mysql, apache), but whether they will play nice or have all the extension support required. I suspect ZeroMQ might be a sticking point.
Well, the landscape is changing, and ARM is getting more and more popular. You get more processor power and more memory compared to Intel and AMD traditional processors. And there might also be advantages in power consumption. So you will see more and more demand for it.
So I guess it is a matter of time
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Yes, an open-source CMS running in Docker should work on Hetzner’s ARM64-based servers without any major issues, provided that the CMS and its dependencies support the ARM64 architecture. Most modern CMS platforms, such as WordPress, Ghost, or Strapi, have official or community-supported Docker images for ARM64. Additionally, Ubuntu 22.04 LTS offers strong ARM support, making it a solid choice for running containerized applications. However, you may need to ensure that all required Docker images, plugins, and database services (e.g., MySQL, PostgreSQL) also have ARM64-compatible versions. If any dependencies lack native ARM64 support, you can try using emulation with QEMU, but this might affect performance.