修复异机备份凭证与中断恢复（07-27-offhost-backup-final-fixes）

scripts/backup-db.sh

@@ -71,7 +71,7 @@ if [[ -z "$POSTGRES_DB" || -z "$POSTGRES_USER" || -z "$POSTGRES_PASSWORD" ]]; th
   exit 1
 fi
 
-if ! docker exec -e PGPASSWORD="$POSTGRES_PASSWORD" "$DB_CONTAINER" \
+if ! PGPASSWORD="$POSTGRES_PASSWORD" docker exec -e PGPASSWORD "$DB_CONTAINER" \
   pg_dump -U "$POSTGRES_USER" -d "$POSTGRES_DB" --format=c --no-owner --no-acl \
   >"$OUT_FILE"; then
   rm -f -- "$OUT_FILE"