feat: Add CUDA 12.6 builds, update HPC-X & NCCL #41
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CUDA 12.6, HPC-X 2.20, & NCCL Updates
This change adds a build for CUDA 12.6 on Ubuntu 22.04 and 20.04. It also updates HPC-X to version 2.20 on all CUDA 12.x builds, and updates NCCL to the latest version available for each build, up to 2.23.4-1.
It additionally removes older odd-numbered builds for CUDA 12.1 and CUDA 12.3, which no longer receive updated NCCL builds from NVIDIA, and removes unsupported image tags from the README. (If CUDA 12.3 is still desired, we can add it back.)
The supported image tags after this change would be 12.0, 12.2, 12.4, and 12.6 on Ubuntu 22.04 and 20.04, as well as 11.8 only on Ubuntu 20.04.
This additionally includes a change for cross-arch build pipeline compatibility while building OpenMPI.