fix: grafana code in wworkflow

Author: fbeneventi

.github/workflows/installation-test.yml

@@ -9,7 +9,7 @@ on:
     branches:
       - master
       - develop
-      
+
 jobs:
   test-installation:
     runs-on: ubuntu-latest
@@ -39,7 +39,7 @@ jobs:
       - name: Test Grafana accessibility
         run: |
           # Wait for Grafana to be ready
-          timeout 60s bash -c 'while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' http://localhost:3000)" != "200" ]]; do sleep 5; done' || exit 1
+          timeout 60s bash -c 'while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' http://localhost:3000)" != "302" ]]; do sleep 5; done' || exit 1
 
       - name: Test MQTT broker
         run: |