feat: enhance CI/CD pipeline with build and push steps for Docker images

Dockerfile

@@ -6,13 +6,10 @@ ENV PYTHONUNBUFFERED=1
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV FLASK_ENV=production
 ENV FLASK_SECRET=production-secret-change-me
+ENV APT_CACHER_NG=http://192.168.88.14:3142
 
-# Find location of apt sources list and change to a faster mirror
-RUN [ -f /etc/apt/sources.list ] && \
-    echo "/etc/apt/sources.list exists, proceeding to modify it." \ 
-    && sed -i 's|http://deb.debian.org/debian|https://mirror.init7.net/debian|g' /etc/apt/sources.list \
-    || \
-    (echo "/etc/apt/sources.list does not exist, exiting.")
+# Add apt-cacher-ng configuration
+RUN echo 'Acquire::http { Proxy "'"$APT_CACHER_NG"'/"; };' > /etc/apt/apt.conf.d/01proxy
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y \