Try another mirror for openeuler

```
[MIRROR] asio-devel-1.28.1-1.oe2403.x86_64.rpm: Curl error (92): Stream error in the HTTP/2 framing layer for https://repo.openeuler.org/openEuler-24.03-LTS/everything/x86_64/Packages/asio-devel-1.28.1-1.oe2403.x86_64.rpm [HTTP/2 stream 67 was not closed cleanly: INTERNAL_ERROR (err 2)]
```

Author: RazvanLiviuVarzaru

ci_build_images/centos.Dockerfile

@@ -9,7 +9,9 @@ LABEL maintainer="MariaDB Buildbot maintainers"
 
 # Install updates and required packages
 # hadolint ignore=SC2086
-RUN dnf -y install 'dnf-command(config-manager)' \
+RUN source /etc/os-release \
+    && if [ "$ID" == "openEuler" ]; then sed -i 's#http://repo.openeuler.org#https://mirrors.dotsrc.org/openeuler#g' /etc/yum.repos.d/openEuler.repo; fi \ 
+    && dnf -y install 'dnf-command(config-manager)' \
     && source /etc/os-release \
     && ARCH=$(rpm --query --queryformat='%{ARCH}' rpm) \
     && case "$PLATFORM_ID" in \