Disable centos-8 builds

CentOS 8 builds are failing because the distro is EOL and the mirrors
have been removed from upstream CI.

If any contributors want to pick up fixing it, they can do that but
we need this to unblock the gates.

Change-Id: Ifec4d2021e0a87a79fc212aa4613d43ead5acf67

playbooks/vars.yaml

@@ -19,23 +19,23 @@ reuse_requirements: False
 loci_src_dir: "src/opendev.org/openstack/loci"
 
 distros:
-  - name: centos
-    image: centos:8
-    release: master
-    buildargs:
-      base:
-        PACKAGE_MIRROR: "{{ zuul_site_mirror_fqdn }}"
-        PIP_INDEX_URL: http://{{ zuul_site_mirror_fqdn }}/pypi/simple
-        PIP_TRUSTED_HOST: "{{ zuul_site_mirror_fqdn }}"
-      project:
-        PROJECT: "{{ project }}"
-        PROJECT_REPO: http://172.17.0.1/git/openstack/{{ project }}
-        WHEELS: 172.17.0.1:5000/loci/requirements:master-centos
-        FROM: base:centos
-      requirements:
-        PROJECT: requirements
-        PROJECT_REPO: http://172.17.0.1/git/openstack/requirements
-        FROM: base:centos
+  # - name: centos
+  #   image: centos:8
+  #   release: master
+  #   buildargs:
+  #     base:
+  #       PACKAGE_MIRROR: "{{ zuul_site_mirror_fqdn }}"
+  #       PIP_INDEX_URL: http://{{ zuul_site_mirror_fqdn }}/pypi/simple
+  #       PIP_TRUSTED_HOST: "{{ zuul_site_mirror_fqdn }}"
+  #     project:
+  #       PROJECT: "{{ project }}"
+  #       PROJECT_REPO: http://172.17.0.1/git/openstack/{{ project }}
+  #       WHEELS: 172.17.0.1:5000/loci/requirements:master-centos
+  #       FROM: base:centos
+  #     requirements:
+  #       PROJECT: requirements
+  #       PROJECT_REPO: http://172.17.0.1/git/openstack/requirements
+  #       FROM: base:centos
   - name: ubuntu_focal
     image: ubuntu:focal
     release: master