Fix OSD header regex to match double-digit OSD numbers

The ceph-volume lvm list output varies the number of trailing equals
signs based on OSD number length:
- Single digit: "====== osd.5 =======" (7 equals)
- Double digit: "====== osd.19 ======" (6 equals)

Changed regex to require exactly 6 trailing equals, which matches
both formats.

Fixes: #17

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

driveAtlas.sh

@@ -667,8 +667,9 @@ build_ceph_cache() {
     local current_osd=""
     local osd_count=0
     while IFS= read -r line; do
-        # Match OSD header: "====== osd.5 ======="
-        if [[ "$line" =~ ======[[:space:]]+osd\.([0-9]+)[[:space:]]+======= ]]; then
+        # Match OSD header: "====== osd.5 =======" or "====== osd.19 ======"
+        # Number of trailing equals varies based on OSD number length
+        if [[ "$line" =~ ======[[:space:]]+osd\.([0-9]+)[[:space:]]+====== ]]; then
             current_osd="osd.${BASH_REMATCH[1]}"
         # Match "devices" line which has the actual physical device: "      devices                   /dev/sda"
         # This is more reliable than "block device" which may show LVM paths