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

data/Dockerfiles/rspamd/docker-entrypoint.sh

@@ -86,7 +86,8 @@ if [[ "${SKIP_OLEFY}" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
     rm /etc/rspamd/local.d/external_services.conf
   fi
 else
-  cat <<EOF > /etc/rspamd/local.d/external_services.conf
+  if [[ ! -f /etc/rspamd/local.d/external_services.conf ]]; then
+    cat <<EOF > /etc/rspamd/local.d/external_services.conf
 oletools {
   # default olefy settings
   servers = "olefy:10055";
@@ -100,6 +101,7 @@ oletools {
   retransmits = 1;
 }
 EOF
+  fi
 fi
 
 # Provide additional lua modules