fix(e2e): make workflow self-sufficient with RBAC apply steps (PRI-324)

- Apply e2e-ci-runner RBAC + polaris RBAC in workflow before pre-flight check
- Add e2e-ci-runner-polaris Role+RoleBinding so CI runner can manage polaris namespace RBAC
- Add roles/rolebindings CRUD to e2e-ci-runner Role (headlamp-dev namespace)
- Collapsed MISSING_ROLE/MISSING_ROLEBINDING into single MISSING flag (QA nit)
- Drop non-standard --quiet flag on kubectl auth can-i (QA nit)

Address PRI-324 QA feedback: workflow now applies its own RBAC so the pre-flight
check is meaningful and the green path is achievable.

.github/workflows/e2e.yaml

@@ -45,6 +45,35 @@ jobs:
       - name: Setup kubectl
         uses: azure/setup-kubectl@v4
 
+      - name: Apply RBAC for E2E pipeline
+        run: |
+          set -x
+          kubectl apply -f deployment/e2e-ci-runner-rbac.yaml --dry-run=server 2>&1 || true
+          kubectl apply -f deployment/e2e-ci-runner-rbac.yaml 2>&1
+          echo "exit code: $?"
+          echo "Waiting for RBAC propagation..."
+          sleep 5
+          echo "Verifying CI runner permissions..."
+          kubectl auth can-i create roles -n headlamp-dev --as="system:serviceaccount:arc-runners:runners-privilegedescalation-gha-rs-no-permission" 2>&1 || { echo "::error::CI runner still lacks roles permission after propagation wait"; exit 1; }
+          set +x
+
+      - name: Apply Polaris dashboard RBAC
+        run: kubectl apply -f deployment/polaris-rbac.yaml
+
+      - name: RBAC pre-flight check
+        run: |
+          echo "Checking RBAC resources..."
+          MISSING=0
+          kubectl get role polaris-dashboard-proxy-reader -n polaris -o name >/dev/null 2>&1 || MISSING=1
+          kubectl get rolebinding polaris-dashboard-proxy-reader -n polaris -o name >/dev/null 2>&1 || MISSING=1
+          kubectl auth can-i delete configmaps -n "$E2E_NAMESPACE" 2>/dev/null || MISSING=1
+          if [ "$MISSING" -eq 0 ]; then
+            echo "RBAC pre-flight check passed."
+          else
+            echo "::error::RBAC pre-flight check failed. Missing required permissions."
+            exit 1
+          fi
+
       - name: Install dependencies
         run: npm ci