WebHost: flask caching doesn't do lazy init anymore (#2155)

WebHost.py

@@ -14,7 +14,7 @@ import settings
 
 Utils.local_path.cached_path = os.path.dirname(__file__) or "."  # py3.8 is not abs. remove "." when dropping 3.8
 
-from WebHostLib import register, app as raw_app
+from WebHostLib import register, cache, app as raw_app
 from waitress import serve
 
 from WebHostLib.models import db
@@ -40,6 +40,7 @@ def get_app():
         app.config["HOST_ADDRESS"] = Utils.get_public_ipv4()
         logging.info(f"HOST_ADDRESS was set to {app.config['HOST_ADDRESS']}")
 
+    cache.init_app(app)
     db.bind(**app.config["PONY"])
     db.generate_mapping(create_tables=True)
     return app