remove CentOS from CI

The CentOS docker image no longer works after CentOS8 went EOL.
See #2601 for discussion.

diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index ac8ad5af43d248468241694edfe8b4c8a8765f76..1ce1b667d311e22feceb8b155d509e49def4d86a 100644 (file)
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -188,9 +188,6 @@ jobs:
                       image: "ubuntu:20.04"
                       ubuntu: 20
                       install_mode: install-apache
-                    - name: Centos-8
-                      flavour: centos
-                      image: "centos:8"
 
         container:
             image: ${{ matrix.image }}