[ci] Update CentOS 8 container

CentOS 8 container was missing ``which``, so collectd was failing to
build. This was causing failures in the container builds.

Signed-off-by: Emma Foley <efoley@redhat.com>
Change-Id: I3702b45bd41ca677178d4b38163d2366b75c035d

diff --git a/systems/centos/8/build_base_machine.sh b/systems/centos/8/build_base_machine.sh
index 1a59084..bb3caa1 100755 (executable)
--- a/systems/centos/8/build_base_machine.sh
+++ b/systems/centos/8/build_base_machine.sh
@@ -52,6 +52,7 @@ pkg-config
 git-core
 sudo
 rpm-build
+which
 libcap-devel
 xfsprogs-devel
 iptables-devel