ci: speed up zypper and disable metalink in CI

Configure zypper to use 10 concurrent download connections and
disable metalink.  Metalink causes zypper to issue partial/range
downloads which prevents the squid proxy from caching complete
objects.  The settings are applied to both the host and the
compute node chroot via the recipe file.

Generated with Claude Code (https://claude.ai/code)

Signed-off-by: Adrian Reber <areber@redhat.com>

Author: Adrian Reber

ansible/roles/test/files/support_functions.sh

@@ -429,6 +429,16 @@ install_openHPC_cluster() {
 		sed 's|#<<< ohpc_proxy:compute >>>#|echo "max_parallel_downloads=10" >> $CHROOT/etc/dnf/dnf.conf\necho "debuglevel=1" >> $CHROOT/etc/dnf/dnf.conf|' -i "${recipeFile}"
 	fi
 
+	if [ "${PKG_MANAGER}" == "zypper" ]; then
+		# Metalink causes zypper to use partial/range downloads which
+		# breaks caching in the squid proxy.
+		echo "CI Customization: Speed up zypper and disable metalink"
+		echo "download.max_concurrent_connections = 10" >>/etc/zypp/zypp.conf
+		echo "download.use_metalink = false" >>/etc/zypp/zypp.conf
+		# shellcheck disable=SC2016
+		sed 's|#<<< ohpc_proxy:compute >>>#|echo "download.max_concurrent_connections = 10" >> $CHROOT/etc/zypp/zypp.conf\necho "download.use_metalink = false" >> $CHROOT/etc/zypp/zypp.conf|' -i "${recipeFile}"
+	fi
+
 	if [ "${EnableArmCompiler}" == "true" ]; then
 		# enable local ARM1 repository
 		sed -e "s,install arm1-compilers-devel-ohpc,install --enablerepo=ARM1 arm1-compilers-devel-ohpc,g" -i "${recipeFile}"