Add Streamlit Docker auto-sync deployment

readme.md

@@ -39,6 +39,33 @@ spotify_to_tidal --sync-favorites
 
 See example_config.yml for more configuration options, and `spotify_to_tidal --help` for more options.
 
+Streamlit + Docker auto-sync
+----------------------------
+The Streamlit app can run a daily background sync while it is open in Docker.
+It syncs the playlists marked with "Watch" in the app.
+
+Enable it in `config.yml`:
+
+```yaml
+auto_sync:
+  enabled: true
+  daily_at: "03:00"
+  timezone: Europe/Berlin
+  run_on_startup: false
+  sync_external: false
+  sync_favorites: false
+```
+
+Then start the local container:
+
+```bash
+docker compose up -d --build
+```
+
+Open the app at http://localhost:8501. The container mounts the project folder
+so `config.yml`, `session.json`, `.session.yml`, `.cache-*`, and the auto-sync
+status file persist on your machine.
+
 ---
 
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