Specify libs directory

Author: mxamin

.github/workflows/manylinux.yml

@@ -64,6 +64,8 @@ jobs:
               set -eu
               # Make local build helpers importable for isolated PEP 517 backend subprocesses.
               export PYTHONPATH="$PWD${PYTHONPATH:+:${PYTHONPATH}}"
+              # Ensure dependency archives are read from the restored workspace cache even in isolated builds.
+              export PYXMLSEC_LIBS_DIR="$PWD/libs"
 
               # Step: Install system build dependencies (manylinux only)
               echo "== [container] Step: Install system build dependencies (manylinux only) =="