Support valgrind test in Github Actions (#3937)

Author: Yurunsoft

.github/workflows/test.yml

@@ -35,4 +35,5 @@ jobs:
         sudo ${{runner.workspace}}/swoole-src/travis/simple-compile-on-github.sh
     - name: Run Swoole test
       run: |
+        export TRAVIS_BRANCH=${GITHUB_REF##*/}
         ${{runner.workspace}}/swoole-src/travis/route.sh