Trying to ensure single thread tensorflow level

Author: davidrsch

.github/workflows/R-CMD-check.yaml

@@ -46,6 +46,8 @@ jobs:
       MKL_NUM_THREADS: 1
       OPENBLAS_NUM_THREADS: 1
       R_MAX_NUM_DLLS: 999
+      TF_NUM_INTRAOP_THREADS: 1
+      TF_NUM_INTEROP_THREADS: 1
 
     steps:
       - uses: actions/checkout@v4