Skeleton of upgrade test

.github/workflows/upgrade-test.yaml

@@ -0,0 +1,36 @@
+# https://github.com/kyma-project/warden/releases/latest/download/warden-chart.tgz
+name: Upgrade test
+
+on:
+  push:
+    branches: [ "main", "release-*" ]
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - 'examples/**'
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - ready_for_review
+      - converted_to_draft
+
+jobs:
+  upgrade-test:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+    steps:
+      - uses: actions/checkout@v4
+      - name: create single cluster
+        uses: AbsaOSS/k3d-action@4e8b3239042be1dc0aed6c5eb80c13b18200fc79 #v2.4.0
+        with:
+          cluster-name: "k3dCluster"
+          args: >-
+            --agents 1
+            --port 80:80@loadbalancer
+            --port 443:443@loadbalancer
+            --wait
+      - name: install latest warden operator from the release
+        run:  helm install warden https://github.com/kyma-project/warden/releases/latest/download/warden-chart.tgz
+      - name: run integration tests
+        run: make test