debug centos case on github actions

docker-compose.yml

@@ -60,12 +60,8 @@ services:
       - milvus
     command: &centos-command >
       /bin/bash -c "
-        scl enable devtoolset-7 bash
-        scl enable llvm-toolset-7.0 bash
-        which gcc
-        which g++
-        gcc -v
-        g++ -v
+        source scl_source enable devtoolset-7
+        source scl_source enable llvm-toolset-7.0
         /milvus/ci/scripts/build.sh -t Release -o ${MILVUS_INSTALL_PREFIX} -l -u -c
         /milvus/ci/scripts/coverage.sh -o ${MILVUS_INSTALL_PREFIX} -u root -p 123456 -t mysql"