Update Jenkins node setup for EL8

docs/jenkins.md

@@ -54,7 +54,21 @@ https://github.com/theforeman/foreman-infra/tree/master/puppet/modules contains
 
 ### Configuring a new node
 
-For Enterprise Linux:
+For Enterprise Linux 8:
+
+* Ensure yum.puppet.com is configured: [puppet7-release](https://yum.puppet.com/puppet7-release-el-8.noarch.rpm)
+* `yum -y install puppet-agent`
+* `echo "server = puppet.theforeman.org" >> /etc/puppetlabs/puppet/puppet.conf`
+* ensure hostname is set node0X.jenkins.<provider\>.theforeman.org where <provider\> is osuosl or aws for example and that the record is in DNS
+* Make the `puppet` command available: `source /etc/profile.d/puppet-agent.sh`
+* `puppet ssl bootstrap`
+* Sign the certificate on the puppetmaster or via Foreman
+* `puppet agent --test`
+* Set the host group to "Builders" in Foreman
+* Run `puppet agent --test` twice (second run is important, due to the rvm module behaviour)
+
+
+For Enterprise Linux 7:
 
 * Ensure EPEL is configured: [epel-release](https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm)
 * Ensure yum.puppet.com is configured: [puppet7-release](https://yum.puppet.com/puppet7-release-el-7.noarch.rpm)