fix: also exclude logs/ (plural) directories from the archive

Some sites use logs/ instead of log/ (e.g. webscroll.fr/logs/nginx/) -
the previous re:/log/ pattern didn't match the plural, so those files
kept showing up as modified every backup.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

borg-backup.sh

@@ -244,7 +244,7 @@ fi
 # MariaDB stays up throughout: the dump above is already transactionally
 # consistent, and the container's raw data directory carries a .nobackup
 # marker (excluded here via --exclude-if-present) so its live files are
-# never read by borg. Per-site log/ dirs (nginx access/error logs etc.)
+# never read by borg. Per-site log/ or logs/ dirs (nginx access/error logs etc.)
 # are excluded too - they churn on every request, so backing them up adds
 # noise and dedup overhead for no recovery value.
 step "Step 2: Creating archive $ARCHIVE"
@@ -259,7 +259,7 @@ run_cmd timeout --signal=INT --kill-after=120s "$CREATE_TIMEOUT" \
         --exclude-caches \
         --exclude-if-present .nobackup \
         --keep-exclude-tags \
-        --exclude 're:/log/' \
+        --exclude 're:/logs?/' \
         "::$ARCHIVE" \
         "$TARGET"