Fix backup.sh: run gitea dump as git user, create tempdir

backup.sh

@@ -33,12 +33,12 @@ mkdir -p "${YADISK_MOUNT}/gitea-backups" 2>/dev/null
 echo "   → Выполняем gitea dump (БД + репозитории + вложения + конфиг)..."
 cd "${COMPOSE_DIR}" || exit 1
 
-docker compose exec -T "${GITEA_CONTAINER}" \
-  gitea dump \
-    --file "/tmp/${DUMP_FILE}" \
+docker compose exec -T -u git "${GITEA_CONTAINER}" \
+  sh -c "mkdir -p /tmp/gitea-dump-tmp && gitea dump \
+    --file \"/tmp/${DUMP_FILE}\" \
     --tempdir /tmp/gitea-dump-tmp \
     --skip-log \
-    --skip-custom-dir
+    --skip-custom-dir"
 
 DUMP_EXIT=$?