PostgreSQL: Set scram-sha-256 as default host auth method

roles/installer/templates/tower_postgres.yaml.j2

@@ -41,6 +41,10 @@ spec:
                   key: password
             - name: PGDATA
               value: '{{ tower_postgres_data_path }}'
+            - name: POSTGRES_INITDB_ARGS
+              value: '{{ postgres_initdb_args }}'
+            - name: POSTGRES_HOST_AUTH_METHOD
+              value: '{{ postgres_host_auth_method }}'
           ports:
             - containerPort: 5432
               name: postgres

roles/installer/vars/main.yml

@@ -0,0 +1,3 @@
+---
+postgres_initdb_args: '--auth-host=scram-sha-256'
+postgres_host_auth_method: 'scram-sha-256'