fix: add RBAC apply step to E2E workflow (PRI-550)

Adds 'kubectl apply -f deployment/e2e-ci-runner-rbac.yaml' step to
the E2E workflow before the deploy script runs.

Also corrects E2E_NAMESPACE from headlamp-dev to privilegedescalation-dev
to match the actual namespace where Arc Runners operates.

Fixes PRI-550.
Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/e2e.yaml

@@ -19,7 +19,7 @@ concurrency:
   cancel-in-progress: false
 
 env:
-  E2E_NAMESPACE: headlamp-dev
+  E2E_NAMESPACE: privilegedescalation-dev
   E2E_RELEASE: headlamp-e2e
   # Pin to a known-good Headlamp version. Using :latest is risky because
   # the tag can change between CI runs, causing flaky failures when a newer
@@ -51,6 +51,9 @@ jobs:
       - name: Build plugin
         run: npx @kinvolk/headlamp-plugin build
 
+      - name: Apply RBAC for E2E runner
+        run: kubectl apply -f deployment/e2e-ci-runner-rbac.yaml
+
       - name: Deploy E2E Headlamp instance
         run: scripts/deploy-e2e-headlamp.sh