improved docker startup: frontend now waits for healthy backend

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;"