ci: remove centos from tests temporarily

Author: saitho

.github/workflows/test-integration.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        os: [ 'ubuntu-18.04', 'ubuntu-20.04', 'centos-8' ]
+        os: [ 'ubuntu-18.04', 'ubuntu-20.04' ] # , 'centos-8'
       fail-fast: false
     if: github.event.pull_request.draft == false
     env: