feat: Add environment variables

docker-compose.yaml

@@ -3,3 +3,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+    environment:
+      - EMAIL_TO=${EMAIL_TO:-destinatary}
+      - EMAIL_FROM=${EMAIL_FROM:-owner}
+      - EMAIL_USER=${EMAIL_USER:-user}
+      - EMAIL_PASS=${EMAIL_PASS:-password}