viable/strict/1789505447: Add CUDA 12.6 sm90 build-only job to trunk (#197023)

发生了什么

Adds a build-only Hopper (sm90) job to trunk , plus the CUDA 12.6 CI docker image it needs. Note Stacked on #197022 (the revert of an accidental direct-to-main push of this same change). GitHub will retarget this to main once that merges. Review the 3-file diff here as the real change. Why Nothing in CI compiles for Hopper on CUDA 12.x today: trunk s CUDA builds target cuda-arch-list: '7.5 8.9' the only sm90 builds…

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