Trunk CI for both Trixie x86_64 and AArch64 were set up last month. Both were building fine, but there was some config change on Friday that broke most of the trunk linux toolchain CI, not just these two. I don't see CI for the new 6.4.x branch (Edit: 6.4.x Dockerfiles for Trixie were just added this weekend, so Trixie CI for 6.4 are likely being spun up now), while the stable release branches like 6.3 may not add new distros this late.
I asked last year if there will be distro owners going forward and there likely will, maybe you will volunteer for Debian. 
In the meantime, maybe the linux release manager, @mishal_shah, can let us know what the plans are for Trixie support.