[WIP] Run mosquitto as a service for browser UI tests (#985)

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/tests.yml

@@ -28,6 +28,16 @@ jobs:
       volumes:
         - ./:/app
       options: --user root
+    services:
+      mosquitto:
+        image: eclipse-mosquitto:2
+        ports:
+          - 1883:1883
+        options: >-
+          --health-cmd "mosquitto_sub -t '$SYS/#' -C 1"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
     steps:
       - uses: actions/checkout@v4
         with:
@@ -39,6 +49,9 @@ jobs:
       - name: Run Browser UI Tests
         timeout-minutes: 10
         run: ./scripts/runBrowserTests.sh
+        env:
+          MQTT_BROKER_HOST: mosquitto
+          MQTT_BROKER_PORT: 1883
       - name: Upload Test Screenshots
         if: always()
         uses: actions/upload-artifact@v4