Re-add healthcheck with a longer start-period

Dockerfile

@@ -38,8 +38,8 @@ USER app
 EXPOSE 8080
 
 # Health check
-#HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-#    CMD curl -f http://localhost:8080/ || exit 1
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD curl -f http://localhost:8080/ || exit 1
 
 # Run the application
 CMD ["python", "main.py"]