The other comments talk about Asahi Linux, which doesn't support the M3 yet. You can also run Linux in a VM on MacOS, and it runs very well.
For some uses you won't get the best performance compared to native Linux. But for a Plex/Kodi server a VM should be great.
(On an x86 Apple laptop I found the power consumption better with a Linux VM on MacOS than with native Linux, so VMs can be quite efficient for some uses. Software builds sometimes run much faster in a Linux VM inside MacOS than natively in MacOS. On the other hand, I found Qemu inside a Linux VM for Android development was extremely slow.)
One of the reasons Asahi doesn't support M3, is that Apple never released a Mac Mini, so they can't do continuous integration. [1] That being said, it seems Apple does re use a lot of the parts on the SoC in each generation, so it's not too different.
For some uses you won't get the best performance compared to native Linux. But for a Plex/Kodi server a VM should be great.
(On an x86 Apple laptop I found the power consumption better with a Linux VM on MacOS than with native Linux, so VMs can be quite efficient for some uses. Software builds sometimes run much faster in a Linux VM inside MacOS than natively in MacOS. On the other hand, I found Qemu inside a Linux VM for Android development was extremely slow.)