Update ci.yml

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
         maven-version: 3.6.1
     
     - name: 'Start apache SkyWalking mock collector'
-      run: cd skywalking-agent-test-tool && mvn package -DskipTests && unzip ./dist/mock-collector.tar.gz -d ./mock-collector && nohup bash ./mock-collector/bin/collector-startup.sh & && cd ..
+      run: cd skywalking-agent-test-tool && mvn package -DskipTests && unzip ./dist/mock-collector.tar.gz -d ./mock-collector && nohup bash -c './mock-collector/bin/collector-startup.sh' &
       
     - name: Check mock collector
       run: curl http://localhost:12800/status