[Rocky ONLY] Fix haproxy cert inject for check mode

Fixes the "Assign bootstrap node" task so that it runs under check mode
so that the bootstrap_node variable is created. Otherwise, the
subsequent tasks that use that variable fail during check mode.

This is a Rocky ONLY backport since it's no longer relevant on master
due to the template being refactored in:
https://review.openstack.org/#/c/605430/

Change-Id: I213abb3fe4608f9a4b6b1ce4956feb6e2766088f
Closes-Bug: #1795488
(cherry picked from commit 72dcf19b88)

puppet/services/haproxy-public-tls-inject.yaml

@@ -85,8 +85,9 @@ outputs:
                 path: "{{cert_path}}"
 
             - name: Assign bootstrap node
-              command: hiera -c /etc/puppet/hiera.yaml bootstrap_nodeid
+              command: hiera -c /etc/puppet/{{ ansible_check_mode | ternary('/check-mode', '') }}/hiera.yaml bootstrap_nodeid
               register: bootstrap_node
+              check_mode: no
 
             - name: set is_bootstrap_node fact
               set_fact: is_bootstrap_node={{bootstrap_node.stdout|lower == ansible_hostname|lower}}