Make web interface accessible for Docker deployment by default (#2189)

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.10-slim
+FROM python:3.11-slim
 LABEL maintainer="Soxoj <soxoj@protonmail.com>"
 WORKDIR /app
 RUN pip install --no-cache-dir --upgrade pip
@@ -13,4 +13,6 @@ RUN apt-get update && \
     rm -rf /var/lib/apt/lists/* /tmp/*
 COPY . .
 RUN YARL_NO_EXTENSIONS=1 python3 -m pip install --no-cache-dir .
+# For production use, set FLASK_HOST to a specific IP address for security
+ENV FLASK_HOST=0.0.0.0
 ENTRYPOINT ["maigret"]