exchange variable for hard string

.gitlab-ci.yml

@@ -4,13 +4,13 @@ services:
   - postgres:latest
 
 variables:
-  DB_NAME: $POSTGRES_DB
+  DB_NAME: "fahrtenbuch"
   DB_USER: $POSTGRES_USER
   DB_HOST: postgres
   DB_DRIVER: postgres
   DB_PASSWORD: $POSTGRES_PASSWORD
   TEST_DB_NAME: test
-  POSTGRES_DB: $POSTGRES_DB
+  POSTGRES_DB: "fahrtenbuch"
   POSTGRES_USER: $POSTGRES_USER
   POSTGRES_PASSWORD: $POSTGRES_PASSWORD
   POSTGRES_HOST_AUTH_METHOD: trust