Map avx512 detection to CPU

Author: AntoinePrv

.github/workflows/linux.yml

@@ -131,7 +131,6 @@ jobs:
             export XSIMD_TEST_CPU_ASSUME_AVX512F="1"
           ../../sde-external-9.48.0-2024-11-25-lin/sde64 -tgl -- ./test_xsimd
         else
-            # Explicitly assume the runner will not have avx512, which may change in the future
-            export XSIMD_TEST_CPU_ASSUME_AVX512F="0"
+            export XSIMD_TEST_CPU_ASSUME_AVX512F=$(grep -q 'avx512f' /proc/cpuinfo && echo "1" || echo "0")
           ./test_xsimd
         fi