Fixing syntax error

Author: ktakashi

.github/workflows/artifact.yml

@@ -66,7 +66,8 @@ jobs:
         id: upload-doc-artifact
         with:
           name: sagittarius-doc-${{ inputs.suffix }}
-          path: ./build/doc/**
-          !path: ./build/doc/CMakeFiles/*
-          !path: ./build/doc/*.cmake
+          path: |
+            ./build/doc/**
+           !./build/doc/CMakeFiles/*
+           !./build/doc/*.cmake
           compression-level: 0