Changed base image to alpine:latest.

docker/docker-compose.yml

@@ -7,7 +7,7 @@ services:
       context: ../.
       dockerfile: ./docker/Dockerfile
     working_dir: /app
-    entrypoint: ./fritzab2matrix.py
+    entrypoint: /bin/sh -c "export UNBUFFERED=1 && python3 -u ./fritzab2matrix.py"
     volumes:
       - ../.:/app