Give database config to smtp service too

compose.yml

@@ -100,9 +100,18 @@ services:
   smtp:
     image: "foodcoops/foodsoft:4.7.0"
     command: ./proc-start mail
+    configs:
+      - source: db_config
+        target: /usr/src/app/config/database.yml
+    secrets:
+      - db_password
     environment:
       - SMTP_SERVER_PORT
       - SMTP_SERVER_HOST
+      - MYSQL_DB
+      - MYSQL_HOST
+      - MYSQL_PORT
+      - MYSQL_USER
     networks:
       - internal