Fix browser UI tests: Enable anonymous access for mosquitto 2 (#994)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomasnordquist <7721625+thomasnordquist@users.noreply.github.com>

.github/workflows/docker-browser.yml

@@ -45,6 +45,8 @@ jobs:
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
+          --entrypoint sh
+        cmd: -c "mkdir -p /mosquitto/config && echo 'listener 1883' > /mosquitto/config/mosquitto.conf && echo 'allow_anonymous true' >> /mosquitto/config/mosquitto.conf && exec mosquitto -c /mosquitto/config/mosquitto.conf"
 
     steps:
       - name: Checkout repository