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d79249d279ci: add chimera Linux LTO CI job (fanquake) Pull request description: Adds a CI config based on using [Chimera Linux](https://chimera-linux.org/). This might be interesting for any of the following: * Chimera is based on LLVM & musl libc - we test both of these in isolation, but not together. * No GNU components. I don't think we have an existing Linux CI job that doesn't have a gcc/stdlibc++ install. This exercises the depends logic for a fully LLVM/Clang/lld only build, including building the native tools (related to #33902). * We don't currently have a job with LTO enabled (here using CMakes `CMAKE_INTERPROCEDURAL_OPTIMIZATION`, which is `-flto=thin` for LLVM/Clang). I think this is worth having generally (we do use LTO in some other places, like oss-fuzz). If runtime is too much of an issue, then it could also be dropped. (Chimera itself is also compiled with LTO). QT in depends doesn't build (#32744), so is excluded for now. Chimera has pointed out at least a few quirks, i.e #34390, #34408 and https://github.com/bitcoin/bitcoin/pull/29963#discussion_r2707922298. ACKs for top commit: maflcko: lgtm ACKd79249d279hebasto: ACKd79249d279. Tree-SHA512: 1174a7462bf2e7433a2c27a6cf398e94b05db42bb414629c71cf9f9a297ca269e173ae1b7517b30510b494b4397f918eef706d3c75c4286767c5557aeb6db4c7