Merge branch 'john_long-add-support-for-rhel-8-db-key-lookup' into 'master'

Add rhel 8 to helper and selinux files

See merge request gitlab-org/omnibus-gitlab!4501

changelogs/unreleased/john_long-add-support-for-rhel-8-db-key-lookup.yml

+---
+title: Add rhel 8 to helper and selinux files
+merge_request: 4501
+author:
+type: fixed

files/gitlab-cookbooks/gitlab/recipes/selinux.rb

@@ -15,7 +15,7 @@
 # limitations under the License.
 #
-if RedhatHelper.system_is_rhel7?
+if RedhatHelper.system_is_rhel7? || RedhatHelper.system_is_rhel8?
   ssh_keygen_module = 'gitlab-7.2.0-ssh-keygen'
   execute "semodule -i /opt/gitlab/embedded/selinux/rhel/7/#{ssh_keygen_module}.pp" do
     not_if "getenforce | grep Disabled"

files/gitlab-cookbooks/package/libraries/helpers/redhat_helper.rb

@@ -3,6 +3,10 @@ class RedhatHelper
     platform_family == 'rhel' && platform_version =~ /7\./
   end
+  def self.system_is_rhel8?
+    platform_family == 'rhel' && platform_version =~ /8\./
+  end
+
   def self.platform_family
     case platform
     when /oracle/, /centos/, /redhat/, /scientific/, /enterpriseenterprise/, /amazon/, /xenserver/, /cloudlinux/, /ibm_powerkvm/, /parallels/