custom WAL location: include custom_wal_dir tasks in playbook add_pgnode.yml

Make sure pg_xlog/pg_wal is symlink. If custom path to WAL directory is specified in "postgresql_wal_dir" variable.

Execution of custom_wal_dir tasks is safe when scaling the cluster, since "add_pgnode.yml" playbook runs this tasks only on nodes added to the "replica" group.

https://github.com/vitabaks/postgresql_cluster#cluster-scaling

Author: vitabaks

roles/patroni/tasks/main.yml

@@ -904,8 +904,7 @@
 
 # create symlink pg_xlog/pg_wal to custom WAL dir
 - import_tasks: custom_wal_dir.yml
-  when: (postgresql_wal_dir is defined and postgresql_wal_dir | length > 0) and
-        (existing_pgcluster is not defined or not existing_pgcluster|bool)  # exclude playbook add_pgnode.yml
+  when: postgresql_wal_dir is defined and postgresql_wal_dir | length > 0
   tags: patroni, custom_wal_dir
 
 # disable postgresql from autostart