use extra vars to override concrete environment in packer

Author: sjpb

environments/common/inventory/group_vars/builder/defaults.yml

@@ -12,4 +12,3 @@ block_devices_mount_state: present
 basic_users_manage_homedir: false
 grafana_state: stopped # as it tries to listen on the "real" grafana node
 grafana_datasources: [] # as grafana won't be up - NB also dashboards are downloaded but not imported
-openhpc_slurm_partitions: [] # as no compute nodes will be in play, but partition definition might exist in inventory

packer/openstack.pkr.hcl

@@ -97,7 +97,7 @@ build {
     groups = concat(["builder"], split("-", "${source.name}"))
     keep_inventory_file = true # for debugging
     use_proxy = false # see https://www.packer.io/docs/provisioners/ansible#troubleshooting
-    extra_arguments = ["--limit", "builder", "-i", "./ansible-inventory.sh", "-vv"]
+    extra_arguments = ["--limit", "builder", "-i", "./ansible-inventory.sh", "-vv", "-e", "@extra_vars.yml"]
   }
 
   post-processor "manifest" {