improved docker startup: frontend now waits for healthy backend

frontend/Dockerfile

@@ -27,6 +27,10 @@ FROM nginx:stable-alpine
 # Copy built files
 COPY --from=build-stage /app/dist /usr/share/nginx/html
 
+# Copy entrypoint script
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
 # Custom Nginx config to handle React Router (SPA)
 RUN printf 'server {\n\
     listen 80;\n\
@@ -38,4 +42,4 @@ RUN printf 'server {\n\
 }' > /etc/nginx/conf.d/default.conf
 
 EXPOSE 80
-CMD ["nginx", "-g", "daemon off;"]
+ENTRYPOINT ["/entrypoint.sh"]

frontend/entrypoint.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# The backend hostname is 'holy-backend' based on docker-compose.yml
+# We wait for port 8000 to be open
+echo "Waiting for backend (holy-backend:8000) to be available..."
+
+MAX_RETRIES=30
+COUNT=0
+
+while ! nc -z holy-backend 8000; do
+  COUNT=$((COUNT + 1))
+  if [ $COUNT -ge $MAX_RETRIES ]; then
+    echo "Backend timed out after $MAX_RETRIES attempts - starting Nginx anyway"
+    break
+  fi
+  echo "Backend is unavailable (attempt $COUNT/$MAX_RETRIES) - sleeping"
+  sleep 2
+done
+
+echo "Starting Nginx..."
+exec nginx -g "daemon off;"