ci(Gubbins): add extension workflow

.github/workflows/extension.yml

@@ -0,0 +1,60 @@
+name: Gubbins extension
+
+on:
+    push:
+      branches-ignore:
+        - dependabot/**
+        - release-please-**
+    pull_request:
+      branches-ignore:
+        - release-please-**
+
+defaults:
+    run:
+      shell: bash -el {0}
+
+jobs:
+    run-demo:
+      runs-on: ubuntu-latest
+      if: github.event_name != 'push' || github.repository == 'DIRACGrid/diracx-web'
+      steps:
+      - uses: actions/checkout@v4
+
+      - name: Clone source
+        run: |
+          cd ..
+          git clone https://github.com/DIRACGrid/diracx-charts.git
+      - name: Start demo
+        run: |
+          cd ..
+          diracx-charts/run_demo.sh --exit-when-done diracx-web/packages/extensions
+      - name: Debugging information
+        run: |
+          cd ../diracx-charts
+          export KUBECONFIG=$PWD/.demo/kube.conf
+          .demo/kubectl get pods
+          for pod_name in $(.demo/kubectl get pods -o json | jq -r '.items[] | .metadata.name' | grep -vE '(dex|minio|mysql|rabbitmq|opensearch)'); do
+            echo "${pod_name}"
+            .demo/kubectl describe pod/"${pod_name}" || true
+            for container_name in $(.demo/kubectl get pods $pod_name -o jsonpath='{.spec.initContainers[*].name} {.spec.containers[*].name}'); do
+              echo $pod_name $container_name
+              .demo/kubectl logs "${pod_name}" -c "${container_name}" || true
+            done
+          done
+      - name: Check for success
+        run: |
+          cd ../diracx-charts
+          if [ ! -f ".demo/.success" ]; then
+            echo "Demo failed"
+            cat ".demo/.failed"
+            exit 1
+          fi
+      
+      - name: Set DIRACX_URL
+        run: echo "DIRACX_URL=https://$(ifconfig | grep 'inet ' | awk '{ print $2 }' | grep -v '^127' | head -n 1 | cut -d '/' -f 1).nip.io:8000" >> $GITHUB_ENV
+
+      - name: Start Cypress
+        uses: cypress-io/github-action@v6
+        with:
+          browser: chrome
+          config: baseUrl=${{ env.DIRACX_URL }}