[Rspamd] only recreate external_services.conf file if it was deleted

data/Dockerfiles/rspamd/docker-entrypoint.sh

@@ -86,6 +86,7 @@ if [[ "${SKIP_OLEFY}" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
     rm /etc/rspamd/local.d/external_services.conf
   fi
 else
+  if [[ ! -f /etc/rspamd/local.d/external_services.conf ]]; then
     cat <<EOF > /etc/rspamd/local.d/external_services.conf
 oletools {
   # default olefy settings
@@ -101,6 +102,7 @@ oletools {
 }
 EOF
   fi
+fi
 
 # Provide additional lua modules
 ln -s /usr/lib/$(uname -m)-linux-gnu/liblua5.1-cjson.so.0.0.0 /usr/lib/rspamd/cjson.so