Use simple connection string in config

docker-compose.dev.yml

@@ -18,15 +18,14 @@ services:
                         - ~/.go:/go
                         - ~/.cache:/.cache
                 environment:
-                        BUDGETEER_DB_NAME: budgeteer
-                        BUDGETEER_DB_USER: budgeteer
-                        BUDGETEER_DB_PASS: budgeteer
-                        BUDGETEER_DB_HOST: db:5432
+                        BUDGETEER_DB: postgres://budgeteer:budgeteer@db:5432/budgeteer
                 depends_on:
                         - db
 
         db:
                 image: postgres:14
+                ports:
+                        - 5432:5432
                 volumes:
                         - db:/var/lib/postgresql/data
                 environment: