Check not macOS when looking for TPUs [release]

scripts/.cluster/direct/_direct_env.sh

@@ -6,7 +6,7 @@ if [ -z "$PROJECT_DATA" ]; then
     exit 1
 fi
 if [ -z "$PROJECT_ACCELERATOR_TYPE" ]; then
-    if (env -0 | cut -z -f1 -d= | tr '\0' '\n' | grep -q "TPU_"); then
+    if [ "$(uname)" != "Darwin" ] && (env -0 | cut -z -f1 -d= | tr '\0' '\n' | grep -q "TPU_"); then
         export PROJECT_ACCELERATOR_TYPE=tpu
         export PROJECT_VISIBLE_ACCELERATOR_DEVICES=all
         echo "Detected an environment with TPUs. For this reason, accelerator device dependencies will not be installed to a virtual environment." 1>&2