Fix issue with installation in non-default data_directory on Debian

[rantanevich]

Hello!

I'm trying to install PostgreSQL on a fresh Ubuntu 22.04 with postgresql_data_directory: /data/postgresql, but I'm getting the following error:

TASK [anxs.postgresql : PostgreSQL | Verify postgresql cluster version] ********
fatal: [postgresql-17]: FAILED! => {"changed": false, "cmd": ["grep", "^17$", "/data/postgresql/PG_VERSION"], "delta": "0:00:00.001677", "end": "2025-06-03 15:31:21.968610", "msg": "non-zero return code", "rc": 2, "start": "2025-06-03 15:31:21.966933", "stderr": "grep: /data/postgresql/PG_VERSION: No such file or directory", "stderr_lines": ["grep: /data/postgresql/PG_VERSION: No such file or directory"], "stdout": "", "stdout_lines": []}

The only workaround I've found is to set postgresql_cluster_reset: true, but that's not very convenient.

Instead, I suggest reinitializing the cluster not only when postgresql_cluster_reset: true, but also when postgresql_data_directory is empty (contains no files or directories).