build: check exit code without causing script to fail #1447
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A bug in the CI script caused the entire script to fail if the exit code
of the command for comparing with the existing hash returned a non-zero
exit status. The non-zero exit status for this comparison does not
imply failed execution, since it only indicates that the hash has
changed.
See fixed action here: https://github.com/llvm/torch-mlir/actions/runs/3168739550/jobs/5160152336