chore: move ulimit to systemd and increase a bit

Author: samrose

ansible/files/postgresql_config/postgresql.service.j2

@@ -20,6 +20,6 @@ Restart=always
 RestartSec=5
 OOMScoreAdjust=-1000
 EnvironmentFile=-/etc/environment.d/postgresql.env
-
+LimitNOFILE=16384
 [Install]
 WantedBy=multi-user.target

ansible/tasks/setup-postgres.yml

@@ -311,11 +311,3 @@
     - 'export LC_CTYPE="en_US.UTF-8"'
   become: yes
   when: nixpkg_mode
-
-- name: Postgres - bump up ulimit
-  community.general.pam_limits:
-    domain: postgres
-    limit_item: nofile
-    limit_type: soft
-    value: 4096
-  when: debpkg_mode or nixpkg_mode