[test] fix ci 6

.github/workflows/thread.yml

@@ -35,7 +35,7 @@ jobs:
       run: |
         export SWOOLE_BRANCH=${GITHUB_REF##*/}
         export SWOOLE_THREAD=1
-        export SWOOLE_BUILD_DIR=$(realpath(.))
+        export SWOOLE_BUILD_DIR=$(realpath .)
         export PHP_VERSION=${{ matrix.php }}
         echo ${SWOOLE_BUILD_DIR}
         echo ${SWOOLE_BRANCH}