fix(ci): add install prefix to LD_LIBRARY_PATH for gen scripts

The custom op .so (libdeepmd_op_pt.so) has undefined symbols for
compute kernels (tabulate_fusion_se_t_tebd_cpu etc.) that live in
libdeepmd.so.  Without dp_test/lib/ in LD_LIBRARY_PATH, dlopen
succeeds (lazy binding) but torch.jit.script fails when it tries
to resolve the symbols.

Author: Han Wang

source/install/test_cc_local.sh

@@ -45,6 +45,9 @@ if [ -n "${_OP_SO}" ]; then
 		cp "${_OP_SO}" "${_DEEPMD_LIB}/"
 	fi
 fi
+# The custom op .so depends on libdeepmd.so (compute kernels).  Add the
+# install prefix lib/ to LD_LIBRARY_PATH so dlopen can resolve symbols.
+export LD_LIBRARY_PATH=${INSTALL_PREFIX}/lib:${LD_LIBRARY_PATH}
 # When the build uses -fsanitize=leak, the custom op .so requires the LSAN
 # runtime to be preloaded (otherwise dlopen fails).  We disable leak detection
 # in the gen scripts to avoid false reports from torch/paddle internals.