Fix grep exit code in license check

Author: camille-004

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Check license headers (REUSE)
         run: |
-          outputs=$(reuse lint --lines | grep -v -e "src/cuda/tile/VERSION")
+          outputs=$(reuse lint --lines | grep -v -e "src/cuda/tile/VERSION" || true)
           if [ -n "$outputs" ]; then
             echo -e "License check failed\n${outputs}"
             exit 1