use PostgreSQL for kontor-spring and kontor-api

kontor-scripts/config.py

@@ -3,6 +3,7 @@ Setup database connections
 """
 import sqlite3
 import mariadb
+import psycopg2
 import logging.config
 from platformdirs import PlatformDirs
 from pathlib import Path
@@ -24,7 +25,8 @@ def get_database_cursors(log, config: str):
         password=db_config['mariadb']['password'],
         database=db_config['mariadb']['database']
     )
-    return sqlite_conn, mariadb_conn
+    postgres_conn = psycopg2.connect(f"host={db_config['postgres']['host']} port={db_config['postgres']['port']} user={db_config['postgres']['user']} password={db_config['postgres']['password']} dbname={db_config['postgres']['']}")
+    return sqlite_conn, mariadb_conn, postgres_conn
 
 
 def create_tables(sqlite_conn, logger, recreate_db, scripts):