add docker files

.env

@@ -0,0 +1,13 @@
+# Public hosts for routing via nginx-proxy
+SOLARDB_API_HOST=db.northdanubesoft.eu
+SOLARDB_UI_HOST=db.northdanubesoft.eu
+
+LETSENCRYPT_EMAIL=macamete.robert@gmail.com
+
+# Flask
+FLASK_ENV=production
+
+# (Optional) If your Flet main file differs:
+# FLET_ENTRY=client/main.py
+
+# For your UI to call the API from the browser, ensure CORS is allowed on API or they share the same parent domain.