Added raven front dsn and enabled preference

api/funkwhale_api/instance/dynamic_preferences_registry.py

+from dynamic_preferences import types
+from dynamic_preferences.registries import global_preferences_registry
+
+raven = types.Section('raven')
+
+
+@global_preferences_registry.register
+class RavenDSN(types.StringPreference):
+    show_in_api = True
+    section = raven
+    name = 'front_dsn'
+    default = 'https://9e0562d46b09442bb8f6844e50cbca2b@sentry.eliotberriot.com/4'
+    verbose_name = (
+        'A raven DSN key used to report front-ent errors to '
+        'a sentry instance'
+    )
+    help_text = (
+        'Keeping the default one will report errors to funkwhale developers'
+    )
+
+
+SENTRY_HELP_TEXT = (
+    'Error reporting is disabled by default but you can enable it if'
+    ' you want to help us improve funkwhale'
+)
+
+
+@global_preferences_registry.register
+class RavenEnabled(types.BooleanPreference):
+    show_in_api = True
+    section = raven
+    name = 'front_enabled'
+    default = False
+    verbose_name = (
+        'Wether error reporting to a Sentry instance using raven is enabled'
+        ' for front-end errors'
+    )