net.sh: Add support for selecting validator GPU mode (#6326)

automerge

multinode-demo/bootstrap-leader.sh

@@ -8,6 +8,11 @@ here=$(dirname "$0")
 # shellcheck source=multinode-demo/common.sh
 source "$here"/common.sh
 
+if [[ "$SOLANA_GPU_MISSING" -eq 1 ]]; then
+  echo "Testnet requires GPUs, but none were found!  Aborting..."
+  exit 1
+fi
+
 if [[ -n $SOLANA_CUDA ]]; then
   program=$solana_validator_cuda
 else