Add secret store choice input

Author: seunghun1ee

.github/workflows/stackhpc-multinode.yml

@@ -25,6 +25,13 @@ name: Multinode
         options:
           - ovn
           - ovs
+      secret_store:
+        description: Secret store to use as Certificate Authority
+        type: choice
+        default: openbao
+        options:
+          - openbao
+          - vault
       upgrade:
         description: Whether to perform an upgrade
         default: none
@@ -63,6 +70,7 @@ jobs:
       os_release: ${{ inputs.os_distribution == 'rocky' && '9' || 'noble' }}
       ssh_username: ${{ inputs.os_distribution == 'rocky' && 'cloud-user' || 'ubuntu' }}
       neutron_plugin: ${{ inputs.neutron_plugin }}
+      secret_store: ${{ inputs.secret_store }}
       upgrade: ${{ inputs.upgrade }}
       break_on: ${{ inputs.break_on }}
       # Workaround loss of number type using fromJSON: https://github.com/orgs/community/discussions/67182