Add info banner when not in production mode

src/allmende_payment_system/tools.py

@@ -1,5 +1,6 @@
 import locale
 import numbers
+import os
 
 from starlette.templating import Jinja2Templates
 
@@ -26,4 +27,6 @@ def get_jinja_renderer() -> Jinja2Templates:
     renderer.env.filters["units_of_measure_de"] = lambda x: UNITS_OF_MEASURE.get(x, x)
     renderer.env.filters["format_number"] = format_number
     renderer.env.filters["timestamp_de"] = lambda x: x.strftime("%d.%m.%Y %H:%M")
+
+    renderer.env.globals["production_mode"] = "APS_PRODUCTION_MODE" in os.environ
     return renderer