x/build: add Debian Trixie builders

[cagedmantis]

Now that Debian 13.0 (Trixie) has been released and designated the current stable release, we should add the new associated builders.

@golang/release

[gopherbot]

Change https://go.dev/cl/708055 mentions this issue: env/linux-arm64-trixie, env/linux-x86-trixie: add Debian Trixie images

[dmitshur]

I started crrev.com/i/8675857 to add internal configuration for the new Debian Trixie builder images, and ran into an issue that our current Debian sid builder reports its OS dimension value as "Debian | Debian-13 | Debian-13.0 | Linux", and we match them by "Debian-13". That's the same value as what Trixie builders will use.

So, our Debian sid builders are effectively providing Trixie-like coverage, and to make progress here, we first need to update them and move them out of Trixie builder's way.

[gopherbot]

Change https://go.dev/cl/712420 mentions this issue: main.star: add linux-arm64_debian13 builder

[dmitshur]

The linux/arm64 trixie builder is up (with a known issue) and seems to be running into some problem with its C toolchain. Some of the packages fail with "running gcc failed [...] cannot find ‘ld’" errors: https://ci.chromium.org/b/8700745007911256481.