(gh-19) Provide pg repos on el platforms

Test runs could not find postgresql 14 on el-8. This snippet (slightly
modified) comes from the main branch and ensures a pg repo is configured
for any el platform so we have access to postgresql packages.

Seems like this should really be part of the puppetdb module though?
Or we should be using the postgresql module maybe?

Author: jpartlow

acceptance/suites/pre_suite/foss/95_install_pdb.rb

@@ -20,6 +20,16 @@
   end
 end
 
+step 'Update EL postgresql repos' do
+  # work around for testing on rhel and the repos on the image not finding the pg packages it needs
+  if master.platform =~ /el-/
+    major_version = master.platform.match(/el-(\d+)/)[1]
+
+    on master, "dnf install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-#{major_version}-x86_64/pgdg-redhat-repo-latest.noarch.rpm"
+    on master, "dnf -qy module disable postgresql"
+  end
+end
+
 step 'Install PuppetDB module' do
   on(master, puppet('module install puppetlabs-puppetdb'))
 end