Add post/firstboot to os cloning

confluent_osdeploy/el8-diskless/profiles/default/scripts/firstboot.custom

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+. /etc/confluent/functions
+# This is a convenient place to keep customizations separate from modifying the stock scripts
+# While modification of the stock scripts is fine, it may be easier to rebase to a newer
+# stock profile if the '.custom' files are used.

confluent_osdeploy/el8-diskless/profiles/default/scripts/firstboot.service

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+[Unit]
+Description=First Boot Process
+Requires=network-online.target
+After=network-online.target
+
+[Service]
+ExecStart=/opt/confluent/bin/firstboot.sh
+
+[Install]
+WantedBy=multi-user.target
+

confluent_osdeploy/el8-diskless/profiles/default/scripts/firstboot.sh

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+#!/bin/sh
+
+# This script is executed on the first boot after install has
+# completed. It is best to edit the middle of the file as
+# noted below so custom commands are executed before
+# the script notifies confluent that install is fully complete.
+
+nodename=$(grep ^NODENAME /etc/confluent/confluent.info|awk '{print $2}')
+confluent_apikey=$(cat /etc/confluent/confluent.apikey)
+confluent_mgr=$(grep deploy_server /etc/confluent/confluent.deploycfg|awk '{print $2}')
+confluent_profile=$(grep ^profile: /etc/confluent/confluent.deploycfg|awk '{print $2}')
+export nodename confluent_mgr confluent_profile
+. /etc/confluent/functions
+exec >> /var/log/confluent/confluent-firstboot.log
+exec 2>> /var/log/confluent/confluent-firstboot.log
+tail -f /var/log/confluent/confluent-firstboot.log > /dev/console &
+logshowpid=$!
+
+if [ ! -f /etc/confluent/firstboot.ran ]; then
+    touch /etc/confluent/firstboot.ran
+
+    cat /etc/confluent/tls/*.pem >> /etc/pki/tls/certs/ca-bundle.crt
+
+    run_remote firstboot.custom
+    # Firstboot scripts may be placed into firstboot.d, e.g. firstboot.d/01-firstaction.sh, firstboot.d/02-secondaction.sh
+    run_remote_parts firstboot.d
+
+    # Induce execution of remote configuration, e.g. ansible plays in ansible/firstboot.d/
+    run_remote_config firstboot.d
+fi
+
+curl -X POST -d 'status: complete' -H "CONFLUENT_NODENAME: $nodename" -H "CONFLUENT_APIKEY: $confluent_apikey" https://$confluent_mgr/confluent-api/self/updatestatus
+systemctl disable firstboot
+rm /etc/systemd/system/firstboot.service
+rm /etc/confluent/firstboot.ran
+kill $logshowpid