feat: make container port configurable via PORT env variable

Dockerfile

@@ -26,9 +26,11 @@ COPY . .
 
 RUN python manage.py collectstatic --noinput 2>/dev/null || true
 
-EXPOSE 8000
+ENV PORT=8000
+
+EXPOSE ${PORT}
 
 HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
-    CMD curl -f http://localhost:8000/health/ || exit 1
+    CMD curl -f http://localhost:${PORT}/health/ || exit 1
 
-CMD ["gunicorn", "score.wsgi:application", "--bind", "0.0.0.0:8000", "--workers", "4", "--threads", "4", "--timeout", "120"]
+CMD sh -c "gunicorn score.wsgi:application --bind 0.0.0.0:${PORT} --workers 4 --threads 4 --timeout 120"

docker-compose.yml

@@ -2,9 +2,10 @@ services:
   web:
     build: .
     ports:
-      - "8000:8000"
+      - "${PORT:-8000}:${PORT:-8000}"
     env_file: .env
     environment:
+      - PORT=${PORT:-8000}
       - CELERY_BROKER_URL=redis://redis:6379/0
       - CELERY_BROKER_BACKEND=redis
     volumes: