Add entrypoint.sh: wait for MariaDB before starting Flask

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -19,6 +19,7 @@ COPY backend/templates ./backend/templates
 # Store DB config in a docker-friendly location (/config), override via DB_CONFIG_PATH env if needed
 COPY backend/config /config
 COPY backend/requirements.txt ./requirements.txt
+COPY backend/entrypoint.sh ./entrypoint.sh
 
 # Frontend aus Build-Stage übernehmen
 COPY --from=frontend-build /app/frontend/dist ./frontend/dist
@@ -26,9 +27,12 @@ COPY --from=frontend-build /app/frontend/dist ./frontend/dist
 # Python-Abhängigkeiten installieren
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Entrypoint ausführbar machen
+RUN chmod +x /app/entrypoint.sh
+
 # Flask starten
 WORKDIR /app/backend
 ENV PYTHONPATH=/app/backend
 ENV DB_CONFIG_PATH=/config/db_config.json
 EXPOSE 5000
-CMD ["python", "app.py"]
+ENTRYPOINT ["/app/entrypoint.sh"]