Fix testnet deployment

net/scripts/add-testnet-solana-user-authorized_keys.sh

@@ -6,13 +6,14 @@ set -ex
 
 [[ -d /home/solana/.ssh ]] || exit 1
 
-cd "$(dirname "$0")"
 
-# shellcheck source=net/scripts/solana-user-authorized_keys.sh
-source solana-user-authorized_keys.sh
+
+if [[ -z $SOLANA_PUBKEYS ]]; then
+  echo "Warning: source solana-user-authorized_keys.sh first"
+fi
 
 # solana-user-authorized_keys.sh defines the public keys for users that should
-# automatically be granted access to ALL testnets.
+# automatically be granted access to ALL testnets
 for key in "${SOLANA_PUBKEYS[@]}"; do
   echo "$key" >> /solana-authorized_keys
 done