Add Centos8 packer jobs

This is a first step into evaluating a migration from Centos7
to Centos8. We need to generate Centos8 nodes to start.

Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: Ic67f34cbcf5579d799c41cd87229312c3336cde3
diff --git a/jjb/ci-management/ci-management-packer-jobs.yaml b/jjb/ci-management/ci-management-packer-jobs.yaml
index 60d74c9..1b41e92 100644
--- a/jjb/ci-management/ci-management-packer-jobs.yaml
+++ b/jjb/ci-management/ci-management-packer-jobs.yaml
@@ -15,6 +15,7 @@
 
     platforms:
       - centos-7
+      - centos-8
       - ubuntu-18.04
       - ubuntu-20.04
     templates: builder
@@ -36,6 +37,7 @@
 
     platforms:
       - centos-7
+      - centos-8
       - ubuntu-18.04-arm64
       - ubuntu-18.04
       - ubuntu-20.04
@@ -78,6 +80,7 @@
 
     platforms:
       - centos-7
+      - centos-8
     templates: redis
     update-cloud-image: true