Fix inverted logic and add 'else' condition

Author: michael.biriley@firstaml.com

hooks/checkout

@@ -11,19 +11,22 @@ NO_CONE_OPTION="$(plugin_read_config NO_CONE "false")"
 NO_CONE_PARAM=""
 [[ $NO_CONE_OPTION = false ]] || NO_CONE_PARAM="--no-cone"
 
-SKIP_SSH_KEYSCAN_OPTION="$(plugin_read_config SKIP_SSH_KEYSCAN "false")"
-
 if plugin_read_list_into_result PATHS; then
     CHECKOUT_PATHS=("${result[@]}")
 else
     echo "Missing 'paths' option in the plugin"
     exit 1
 fi
 
-if [[ "$SKIP_SSH_KEYSCAN_OPTION" != "false" ]]; then
+SKIP_SSH_KEYSCAN_OPTION="$(plugin_read_config SKIP_SSH_KEYSCAN "false")"
+echo "SKIP_SSH_KEYSCAN_OPTION: $SKIP_SSH_KEYSCAN_OPTION"
+
+if [ "$SKIP_SSH_KEYSCAN_OPTION" = "false" ]; then
     echo "Scanning SSH keys for remote git repository"
     [[ -d ~/.ssh ]] || mkdir -p ~/.ssh
     ssh-keyscan "${BUILDKITE_REPO_SSH_HOST}" >> ~/.ssh/known_hosts
+else
+    echo "Skipping SSH keyscan"
 fi
 
 echo "Creating sparse-checkout with paths: ${CHECKOUT_PATHS[*]}"