Refactor Dockerfile and add entrypoint script for improved container initialization

backend/Dockerfile

@@ -18,18 +18,11 @@ RUN uv venv .venv && \
 # Installiere die Abhängigkeiten aus pyproject.toml
 RUN uv sync
 
-# für Admin oberfläche
-#RUN python manage.py createsuperuser
-
-#COPY . .
-
-RUN .venv/bin/python manage.py migrate
-
-# Kopiere den Rest des Projekts in den Container
-
+# Make entrypoint script executable
+RUN chmod +x entrypoint.sh
 
 # Exponiere Port 8000 (für Django)
 EXPOSE 8000
 
-# Startbefehl (z. B. für Django-Projekt)
-CMD ["uv", "run", "python", "manage.py", "runserver", "0.0.0.0:8000"]
+# Use entrypoint script
+CMD ["./entrypoint.sh"]

backend/entrypoint.sh

+#!/bin/bash
+
+# Wait for database to be ready (if needed)
+echo "Starting Django application..."
+
+# Run migrations
+echo "Running database migrations..."
+.venv/bin/python manage.py makemigrations
+.venv/bin/python manage.py migrate
+
+# Create superuser if it doesn't exist (optional)
+echo "Checking for superuser..."
+.venv/bin/python manage.py shell -c "
+from django.contrib.auth import get_user_model
+User = get_user_model()
+if not User.objects.filter(username='admin').exists():
+    User.objects.create_superuser('admin', 'admin@example.com', 'admin123')
+    print('Superuser created')
+else:
+    print('Superuser already exists')
+"
+
+# Start the Django development server
+echo "Starting Django server..."
+exec uv run python manage.py runserver 0.0.0.0:8000