[fix] fatal: repository '/root/searx' does not exist

The $SERVICE_USER (searx) needs read permission to clone repository.  The
installation script stops if permission is not granted.

- https://github.com/asciimoo/searx/pull/1803#issuecomment-616406528

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

utils/searx.sh

@@ -358,6 +358,9 @@ clone_is_available() {
 clone_searx() {
     rst_title "Clone searx sources" section
     echo
+    if ! sudo -i -u "$SERVICE_USER" ls -d "$REPO_ROOT" > /dev/null; then
+        die 42 "user '$SERVICE_USER' missed read permission: $REPO_ROOT"
+    fi
     SERVICE_HOME="$(sudo -i -u "$SERVICE_USER" echo \$HOME 2>/dev/null)"
     if [[ ! "${SERVICE_HOME}" ]]; then
         err_msg "to clone searx sources, user $SERVICE_USER hast to be created first"