Add a temp fix for audio issues with Qt 6.8.1

See https://bugreports.qt.io/browse/QTBUG-130273 for a discussion and
the suggested "dirty workaround", which is applied here.

kiosk/kiosk_browser/__init__.py

@@ -1,4 +1,5 @@
 import sys
+import os
 import logging
 import signal
 from PyQt6.QtCore import Qt, QUrl
@@ -7,10 +8,22 @@
 
 from kiosk_browser import main_widget
 
+# Workaround for https://bugreports.qt.io/browse/QTBUG-130273 in Qt 6.8.1
+# Should be fixed with QT 6.8.2
+# Note: doing this via env variables rather than passing `--webEngineArgs`,
+# because the env variable overrides the args (and so is easy to break in tests,
+# etc)
+def tempFixAudioIssues():
+    curFlags = os.environ.get('QTWEBENGINE_CHROMIUM_FLAGS', "")
+    os.environ['QTWEBENGINE_CHROMIUM_FLAGS'] = curFlags + " --disable-features=FFmpegAllowLists"
+
+
 def start(kiosk_url, settings_url, toggle_settings_key, fullscreen = True):
 
     logging.basicConfig(level=logging.INFO)
 
+    tempFixAudioIssues()
+
     app = QApplication(sys.argv)
     app.setApplicationName("kiosk-browser")