added some tests and fixed server secret to be persistent

backend/compose.yaml

@@ -3,11 +3,11 @@ services:
     image: 'postgres:16'
     container_name: etfo-db
     environment:
-      - 'POSTGRES_DB=etfo-db'
-      - 'POSTGRES_PASSWORD=test'
-      - 'POSTGRES_USER=test'
+      - POSTGRES_DB=etfo-db
+      - POSTGRES_PASSWORD=test
+      - POSTGRES_USER=test
     volumes:
       - ./init.sql:/docker-entrypoint-initdb.d/init.sql
       - ./.db:/var/lib/postgresql/data
     ports:
-      - '5432:5432'
+      - 5432:5432