ci: patch livecd-creator __get_efi_image_stanza LABEL → CDLABEL

Upstream bug in /usr/lib/python3.14/site-packages/imgcreate/live.py:
  if self._isDracut:
      args["rootlabel"] = "live:LABEL=%(fslabel)s"   # WRONG
  else:
      args["rootlabel"] = "CDLABEL=%(fslabel)s"

For dracut path on EFI grub it writes `root=live:LABEL=...` but
dracut needs `live:CDLABEL=...` to look up ISO9660 by CD volume id.
Result: parse-livenet hook stalls indefinitely.

CI now sed-patches the file in-place before build. Reported upstream
livecd-tools as separate task.

.github/workflows/build-iso.yml

@@ -57,6 +57,7 @@ jobs:
               lorax \
               livecd-tools \
               pykickstart \
+              python3-imgcreate \
               anaconda-tui \
               squashfs-tools \
               xorriso \
@@ -67,6 +68,15 @@ jobs:
 
             cd /work
 
+            # PATCH: livecd-creator bug — __get_efi_image_stanza writes
+            # `root=live:LABEL=...` instead of `live:CDLABEL=...` for dracut.
+            # Result: dracut hangs on parse-livenet looking for non-CD label.
+            # Fix in-place before running build.
+            LIVE_PY=$(python3 -c 'import imgcreate, os; print(os.path.dirname(imgcreate.__file__))')/live.py
+            sed -i 's|"live:LABEL=%(fslabel)s"|"live:CDLABEL=%(fslabel)s"|g' "$LIVE_PY"
+            grep -n 'CDLABEL=%(fslabel)s' "$LIVE_PY" || { echo "[ERR] patch failed"; exit 1; }
+            echo "[OK] livecd-creator patched: LABEL= → CDLABEL= for EFI dracut stanza"
+
             # CI uses ks-ci.ks (no local fix-repo line). Generated from main ks.
             # Also strip flags livecd-creator doesn't recognize.
             sed -e '/veilor-fix/d' \