Automation Orchestrator install and tweaks

roles/cloudnativepg_operator/meta/argument_specs.yml

@@ -49,6 +49,11 @@ argument_specs:
         description: Number of Postgres instances in the Cluster (1 = no HA).
         type: int
         default: 1
+      cloudnativepg_operator_enable_pdb:
+        description: >-
+          Create the CNPG primary PodDisruptionBudget. Defaults to true only when instances > 1;
+          a single-instance PDB is always at its limit and blocks node drains.
+        type: bool
       cloudnativepg_operator_image_name:
         description: PostgreSQL container image for the Cluster.
         type: str