CT Linkwarden Postgresq: Debian 13 fixes

linkwarden: removed unnecessary build step, fixed deploy command
postgresql: locked major version, bumpt it from 17 to 18, updated config for compatibility, added sleep to config to make sure Postgres is up
aptcacherng: skips overwriting existing service symlink

CT-Build/Debian.yaml

@@ -1532,7 +1532,15 @@ packages:
 
 #postgresql pkgs
   - packages:
+    - postgresql-common
+    action: install
+    early: true
+    variants:
     - postgresql
+
+#postgresql pkgs (part2)
+  - packages:
+    - postgresql-18
     - pgadmin4-server
     - nano
     - uwsgi